阅读说明：本技术 基于曲面百叶窗原理的tbcc进气道调节机构设计方法 (Method for designing TBCC air inlet channel adjusting mechanism based on curved surface shutter principle ) 是由 穆瑞 张凯瑞 林晓鹰 尤延铖 朱呈祥 于 2020-12-31 设计创作，主要内容包括：基于曲面百叶窗原理的TBCC进气道调节机构设计方法,涉及TBCC进气道。包括以下步骤：1)解决叶片与管壁的干涉问题；2)在闭合时保证通风口的密闭特性；3)基于百叶窗原理实现通风口面积的连续调节；基于四连杆机构原理,以居中的叶片的转动销为主动轴,另一叶片的转动销为从动轴,并设计出传动连杆与两叶片铰接,以实现将主动叶片的运动形式传递给从动叶片的功能,在叶片打开过程中实现同时、连续调节；4)将整体调节机构按照主进气道内壁轮廓进行设计。解决由于平面百叶窗叶片难以与主气道内壁形状吻合,而产生的对气流的诸多负面影响,方便控制,实现在开合过程中对进气道通风面积的同时且连续调节,和在闭合时的完全密闭。(A design method of a TBCC air inlet channel adjusting mechanism based on a curved surface shutter principle relates to a TBCC air inlet channel. The method comprises the following steps: 1) the problem of interference between the blades and the pipe wall is solved; 2) ensuring the sealing property of the vent when closed; 3) the area of the vent is continuously adjusted based on the shutter principle; based on the principle of a four-bar linkage mechanism, a rotating pin of a centered blade is taken as a driving shaft, a rotating pin of the other blade is taken as a driven shaft, and a transmission connecting rod is designed to be hinged with the two blades so as to realize the function of transmitting the motion form of the driving blade to the driven blade and realize simultaneous and continuous adjustment in the opening process of the blades; 4) the integral adjusting mechanism is designed according to the contour of the inner wall of the main air inlet channel. The problem of because the plane shutter blade is difficult to coincide with main air duct inner wall shape, and the produced a great deal of negative effects to the air current, convenient control realizes the while and continuous regulation to intake duct draught area in the process of opening and shutting, and totally airtight when closing.)

1. A design method of a TBCC air inlet channel adjusting mechanism based on a curved surface shutter principle is characterized by comprising the following steps:

1) the problem of interference between the blades and the pipe wall is solved;

2) ensuring the sealing property of the vent when closed;

3) the area of the vent is continuously adjusted based on the shutter principle; based on the principle of a four-bar linkage mechanism, a rotating pin of a centered blade is taken as a driving shaft, a rotating pin of the other blade is taken as a driven shaft, and a transmission connecting rod is designed to be hinged with the two blades so as to realize the function of transmitting the motion form of the driving blade to the driven blade and realize simultaneous and continuous adjustment in the opening process of the blades;

4) the integral adjusting mechanism is designed according to the contour of the inner wall of the main air inlet channel.

2. The method for designing the TBCC air inlet duct adjusting mechanism based on the curved louver principle as claimed in claim 1, wherein in step 1), the specific method for solving the interference problem between the blades and the duct wall is as follows: when the blades are designed, the total area of all the blades is smaller than the cross section area of the intersecting surface of the branch air passage and the main air passage, so that when the blades are opened to a position parallel to the axis of the branch air passage (namely when the blades are completely opened), the blades do not interfere with the pipe wall.

3. The method for designing a TBCC air inlet tuning mechanism based on the curved louver principle as claimed in claim 1, wherein in step 2), the specific method for ensuring the sealing property of the air vent when closing is as follows: the outer frame is designed, so that the cross section of the ventilation opening of the outer frame is matched with the shape of the blade, and the edge of the blade is attached to the outer frame when the blade is closed.

4. The method for designing an intake duct adjusting mechanism of TBCC based on curved louver principle as claimed in claim 1, wherein in step 4), the overall adjusting mechanism is designed according to the contour of the inner wall of the main intake duct by designing the overall structure contour of the adjusting mechanism to be a curved shape having the same cross section as the intersecting surface, designing the outer frame contour of the adjusting mechanism to be the contour of the inner wall of the branch duct, designing the connecting rod to be at the side of the main duct, and fitting the connecting rod to the inner wall of the main duct as much as possible when the louver is completely closed.

Technical Field

The invention relates to the technical field of TBCC air inlet channels, in particular to a design method of a TBCC air inlet channel adjusting mechanism based on a curved surface shutter principle.

Background

The hypersonic aircraft has become the main research direction of future aircraft research and has extremely strong strategic development significance. The hypersonic aircraft has a wide flight range, and the requirement on an engine of the hypersonic aircraft is higher in order that the hypersonic aircraft can normally fly at subsonic speed, quartic speed and supersonic speed.

However, the flight range supported by the aviation turbine engine is Mach number 0-3, the flight range supported by the sub-combustion ramjet is Mach number 2-6, and the super-combustion ramjet can support the flight range with the flight Mach number larger than 6. Therefore, any single air suction type engine cannot support normal flight of the hypersonic speed aircraft in a full speed region, so that researchers carry out extensive and intensive research on combined power.

The Combined engine includes two major types, a RBCC (rocket-Based Combined Cycle) engine and a TBCC (Turbine-Based Combined Cycle) engine. The TBCC engine is developed by combining two technologies of a turbine engine (including a turbojet engine and a turbofan engine) and a ramjet engine (including a sub-combustion ramjet engine, an ultra-combustion ramjet engine and a dual-mode combustion ramjet engine), integrates the advantages of the turbine engine and the ramjet engine in respective applicable flight ranges, has the advantages of conventional take-off and landing, repeated use, high reliability, good low-speed performance, small technical risk and the like, and has good engineering application prospect.

The air intake duct is an important component of the TBCC engine, and how to improve the aerodynamic performance of the air intake duct and the utility under different flight conditions has been considered as one of the key technologies of the TBCC engine. Huebner L D et al have studied the adjustment mechanism with the mode of rotating the lip, and this mechanism seals the intake duct in the boosting process, can improve the reliability and the stability of boosting, and the intake duct can realize the regulation of internal contraction ratio by closing to the process of opening, can make the intake duct of over-compression realize starting and there are too big scheduling problems of adjusting torque in the scheme that single plate adjusted intake duct draught area in the past, but its problem that has can produce certain impact force to the aircraft in the lip opening process. In a TBCC parallel tail nozzle adjusting mechanism embedded in a partition plate, a single partition plate is used for adjusting an air inlet channel by the adjusting mechanism, so that the problems of overlarge adjusting torque and the like are solved. In the design scheme of the TBCC air inlet channel adjusting mechanism based on the shutter principle, the shape of a blade of the adjusting mechanism is a plane, and the adjusting mechanism is difficult to be matched with the shape of the inner wall of a main air channel, so that the problems of negative influence on air flow and the like are caused. Therefore, there is a need for a TBCC inlet adjustment mechanism design based on the curved louver principle to improve and enhance the TBCC engine efficiency throughout the flight.

Disclosure of Invention

The invention mainly aims to overcome the defects in the prior art, and provides a design method of a TBCC air inlet channel adjusting mechanism based on a curved shutter principle, which realizes the adjustment of curved blades on air flow, solves the problem of overlarge torque required by adjusting the air flow of an air inlet channel by using one plate in the prior art, solves the problems of various negative influences on the air flow caused by the fact that the flat shutter blades are difficult to be matched with the shape of the inner wall of a main air channel, is convenient to control, and realizes the simultaneous and continuous adjustment of the ventilation area of the air inlet channel in the opening and closing process and the complete sealing in the closing process.

The invention comprises the following steps:

1) the problem of interference between the blades and the pipe wall is solved;

2) ensuring the sealing property of the vent when closed;

3) the area of the vent is continuously adjusted based on the shutter principle; based on the principle of a four-bar linkage mechanism, a rotating pin of a centered blade is taken as a driving shaft, a rotating pin of the other blade is taken as a driven shaft, and a transmission connecting rod is designed to be hinged with the two blades so as to realize the function of transmitting the motion form of the driving blade to the driven blade and realize simultaneous and continuous adjustment in the opening process of the blades;

4) the integral adjusting mechanism is designed according to the contour of the inner wall of the main air inlet channel.

In step 1), the specific method for solving the problem of interference between the blade and the pipe wall is as follows: when the blades are designed, the total area of all the blades is smaller than the cross section area of the intersecting surface of the branch air passage and the main air passage, so that when the blades are opened to a position parallel to the axis of the branch air passage (namely when the blades are completely opened), the blades do not interfere with the pipe wall.

In step 2), the specific method for ensuring the sealing property of the vent during closing is as follows: the outer frame is designed, so that the cross section of the ventilation opening of the outer frame is matched with the shape of the blade, and the edge of the blade is attached to the outer frame when the blade is closed.

In the step 4), the specific method for designing the overall adjusting mechanism according to the inner wall profile of the main air inlet channel is that the overall structure profile of the adjusting mechanism is designed into a curved surface shape with the same cross section as the cross section, the outline of the outer frame of the adjusting mechanism is designed into the outline of the inner wall of the branch air channel, the connecting rod is designed on one side of the main air channel, and the connecting rod is attached to the inner wall of the main air channel as much as possible when the shutter is completely closed.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention increases the number of the blades of the air inlet channel adjusting mechanism, obviously reduces the starting moment of each blade and improves the motion performance of each blade.

2. The invention realizes the continuous adjustment of the area of the air inlet passage vent and the sealing characteristic when the air inlet passage vent is closed.

3. The invention designs the shape of the blades based on the curved surface shape of the intersecting surface, and solves the problems that when the adjusting mechanism is closed, the planar shutter blades are difficult to be matched with the shape of the inner wall of the main air passage, so that a plurality of negative effects on airflow are generated.

4. The design idea and the functional principle of the invention are suitable for other various single-channel or multi-channel air inlets, and the condition that each intersecting surface in the multi-channel is in an irregular shape is also suitable.

Drawings

Fig. 1 is a schematic diagram of a TBCC air inlet duct adjusting mechanism based on the curved louver principle. The upper is open and the lower is closed.

FIG. 2 is a schematic diagram of a TBCC air inlet adjusting mechanism based on the curved louver principle in a direction parallel to the branch air duct wall when the mechanism is opened. The left is the front and the right is the back.

FIG. 3 is a schematic diagram of a TBCC inlet duct adjusting mechanism based on the curved louver principle in a direction parallel to the branch duct wall when the TBCC inlet duct adjusting mechanism is closed. The left is the front and the right is the back.

Fig. 4 is an exploded view of an open TBCC inlet adjustment mechanism based on the curved louver principle.

Detailed Description

The invention is further described below by means of specific embodiments.

The invention provides a TBCC air inlet channel adjusting mechanism based on the principle of a curved shutter, and in order to make the purpose, the design scheme and the effect of the invention clearer and more clear, the attached drawings of the invention are further explained in detail. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

A design method of a TBCC air inlet channel adjusting mechanism based on a curved surface shutter principle comprises the following steps:

1) the problem of interference between the blades and the pipe wall is solved; when the blades are designed, the total area of all the blades is smaller than the cross section area of the intersecting surface of the branch air passage and the main air passage, so that when the blades are opened to a position parallel to the axis of the branch air passage (namely when the blades are completely opened), the blades do not interfere with the pipe wall.

2) Ensuring the sealing property of the vent when closed; the outer frame is designed, so that the cross section of the ventilation opening of the outer frame is matched with the shape of the blade, and the edge of the blade is attached to the outer frame when the blade is closed.

3) The simultaneous and continuous adjustment is realized in the opening process of the blades; the area of the ventilation opening can be continuously adjusted based on the shutter principle; based on the four-bar mechanism principle, the rotating pin of the centered blade is used as a driving shaft, the rotating pin of the other blade is used as a driven shaft, and a transmission connecting rod is designed to be hinged with the two blades so as to realize the function of transmitting the motion form of the driving blade to the driven blade.

4) Designing the integral adjusting mechanism according to the contour of the inner wall of the main air inlet; the overall structure of the adjusting mechanism is designed into a curved surface shape which is the same as the cross section of the intersecting surface, the outline of the outer frame of the adjusting mechanism is designed into the outline of the inner wall of the branch air channel, the connecting rod is designed at one side of the main air channel, and the connecting rod is attached to the inner wall of the main air channel as much as possible when the shutter is completely closed.

The mechanism adopts the principle of a curved surface shutter, and when one blade is controlled to rotate, the mechanism enables the other blades to rotate at the same angle at the same time by a transmission connecting rod transmission motion mode. Therefore, the invention improves the scheme of adjusting the vent with a single plate into adjusting the vent with two blades, as shown in fig. 1, fig. 1 is a schematic diagram of a TBCC air inlet duct adjusting mechanism based on the curved surface shutter principle when the TBCC air inlet duct adjusting mechanism is completely opened, and the opening angle is the included angle between the plane of the vent and the axis of the duct wall of the air inlet duct; fig. 1 is a schematic diagram of a TBCC air inlet duct adjusting mechanism based on the curved louver principle when it is completely closed.

As shown in fig. 2, the left side of fig. 2 is a schematic front view in a direction parallel to the wall of the inlet duct when a TBCC inlet duct adjusting mechanism based on the curved louver principle is opened, and the right side of fig. 2 is a schematic back view.

As shown in fig. 3, the left side of fig. 3 is a schematic front view in a direction parallel to the wall of the inlet duct when the TBCC inlet duct adjusting mechanism based on the curved louver principle is closed, and the right side of fig. 3 is a schematic back view.

As shown in fig. 4, fig. 4 is an exploded view of an opened TBCC air inlet adjusting mechanism based on the curved louver principle. The mechanism consists of a blade 1, a blade 2, an outer frame 3, a transmission connecting rod 4 and a rotating pin 5.

The movement steps of the adjusting mechanism are as follows: when the ventilation opening is closed, the rotating pin of the blade 2 is controlled to rotate by the power system, and the transmission connecting rod 4 transmits the motion form of the blade 2 to the blade 1, so that all the blades rotate simultaneously and continuously, and the ventilation opening is opened and closed.

As shown in fig. 2 and 3, the outer frame 3 of the present invention is designed to make the cross-sectional shape of the ventilation opening of the outer frame 3 match with the shape of the vane, so that the edge of the vane fits on the outer frame 3 when the vane is closed.

As can be seen from fig. 3, when the size of the blade is designed, in order to prevent the blade from interfering with the pipe wall of the inlet when the blade is opened to a position parallel to the axis of the inlet, the total area of the blade is designed to be smaller than the cross-sectional area of the pipe wall of the inlet.

In order to realize that the adjusting mechanism is more matched with the shape of the pipeline, the whole shape of the adjusting mechanism is designed into a curved surface shape which is the same as the cross section of the intersecting surface, the outline of the outer frame of the adjusting mechanism is designed into the outline of the inner wall of the branch air channel, the connecting rod is designed at one side of the main air channel, and the connecting rod is attached to the inner wall of the main air channel as much as possible when the shutter is completely closed.

The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.