阅读说明：本技术 一种基于百叶窗原理的tbcc进气道调节机构设计方法 (Design method of TBCC air inlet channel adjusting mechanism based on 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：一种基于百叶窗原理的TBCC进气道调节机构设计方法,涉及TBCC进气道技术领域。包括以下步骤：1)在设计叶片尺寸时,使所有叶片总面积小于进气道管壁横截面积,以实现在叶片打开到平行于进气道轴线的位置时,不会与管壁发生干涉。2)在闭合时保证通风口的密闭特性；3)基于百叶窗原理可实现通风口面积的连续调节；基于四连杆机构原理,以居中的某一叶片的转动轴为主动轴,其余叶片的转动轴为从动轴,并设计出连杆与各叶片铰接,以实现将主动叶片的运动形式传递给从动叶片。4)将整体调节机构适应进气道管壁轮廓进行设计。增加进气道调节机构的叶片数量,使各叶片启动力矩明显降低,提高各叶片的运动性能。(A design method of a TBCC air inlet adjusting mechanism based on a shutter principle relates to the technical field of TBCC air inlets. The method comprises the following steps: 1) when the size of the blades is designed, the total area of all the blades is smaller than the cross section area of the pipe wall of the air inlet so as to avoid interference with the pipe wall when the blades are opened to the position parallel to the axis of the air inlet. 2) Ensuring the sealing property of the vent when closed; 3) the area of the ventilation opening can be continuously adjusted based on the shutter principle; based on the four-bar mechanism principle, the rotating shaft of one centered blade is taken as a driving shaft, the rotating shafts of the other blades are taken as driven shafts, and a connecting rod is designed to be hinged with each blade so as to realize that the motion form of the driving blade is transmitted to the driven blade. 4) The integral adjusting mechanism is designed to adapt to the profile of the pipe wall of the air inlet. The number of the blades of the air inlet channel adjusting mechanism is increased, so that the starting torque of each blade is obviously reduced, and the motion performance of each blade is improved.)

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

1) the problem of interference between the blades and the pipe wall is solved, and when the size of the blades is designed, the total area of all the blades is smaller than the cross section area of the pipe wall of the air inlet channel, so that when the blades are opened to the position parallel to the axis of the air inlet channel, the blades cannot interfere with the pipe wall;

2) when the blades are closed, the sealing characteristic of the ventilation opening is ensured, and the outer frame is designed, so that the area of the ventilation opening of the outer frame is smaller than the whole area of the blades, and the edges of the blades are attached to the outer frame;

3) realize simultaneously, continuous regulation in the blade opening process, specifically be: the area of the ventilation opening can be continuously adjusted based on the shutter principle; based on the principle of a four-bar linkage mechanism, a rotating shaft of one centered blade is taken as a driving shaft, rotating shafts of the other blades are taken as driven shafts, and a connecting bar is designed to be hinged with each blade so as to transmit the motion form of the driving blade to the driven blade;

4) the integral adjusting mechanism is designed to adapt to the profile of the pipe wall of the air inlet.

2. The design method of the air intake duct adjusting mechanism of the TBCC based on the louver principle as claimed in claim 1, wherein in step 4), the design of the overall adjusting mechanism to fit the contour of the duct wall of the air intake duct is specifically: the edge profile of the blade is designed to be similar to the profile of the pipe wall of the air inlet, the outline of the outer frame of the adjusting mechanism is designed to be the outline of the pipe wall, the transmission rod is designed to be an upper part and a lower part, and the outline of each part is similar to the outline of the pipe wall of the air inlet.

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 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, so that the problems of overlarge adjusting torque and the like are solved. 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 shutter principle, which solves the problem that the required moment is overlarge when one plate is used for adjusting air flow of an air inlet channel in the prior art, is convenient to control, and realizes simultaneous and continuous adjustment of the ventilation area of the air inlet channel in the opening and closing process and 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, and when the size of the blades is designed, the total area of all the blades is smaller than the cross section area of the pipe wall of the air inlet channel, so that when the blades are opened to the position parallel to the axis of the air inlet channel, the blades cannot interfere with the pipe wall;

2) when the blades are closed, the sealing characteristic of the ventilation opening is ensured, and the outer frame is designed, so that the area of the ventilation opening of the outer frame is smaller than the whole area of the blades, and the edges of the blades are attached to the outer frame;

3) realize simultaneously, continuous regulation in the blade opening process, specifically be: the area of the ventilation opening can be continuously adjusted based on the shutter principle; based on the principle of a four-bar linkage mechanism, a rotating shaft of one centered blade is taken as a driving shaft, rotating shafts of the other blades are taken as driven shafts, and a connecting bar is designed to be hinged with each blade so as to transmit the motion form of the driving blade to the driven blade;

4) the integral adjusting mechanism is designed to adapt to the profile of the pipe wall of the air inlet.

In the step 4), specifically, the edge profile of the blade is designed to be a profile similar to the wall of the air inlet duct, the outer frame profile of the adjusting mechanism is designed to be a wall profile, the transmission rod is designed to be an upper part and a lower part, and the profile of each part is similar to the wall profile of the air inlet duct.

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 design idea and the functional principle of the invention are suitable for other various single-channel or multi-channel air inlets.

Drawings

Fig. 1 is a schematic diagram of a TBCC air inlet regulating mechanism based on the shutter principle. The upper is open and the lower is closed.

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

FIG. 3 is a schematic view of a TBCC inlet duct adjusting mechanism based on the louver principle, in a direction parallel to the wall of the inlet duct when the 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 shutter 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 a shutter principle, and in order to make the purpose, the design scheme and the effect of the invention clearer and clearer, 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.

The invention comprises the following steps:

1) the problem of the interference of blades and the pipe wall is solved, and when the size of the blades is designed, the total area of all the blades is smaller than the cross sectional area of the pipe wall of the air inlet channel, so that when the blades are opened to the position parallel to the axis of the air inlet channel, the interference with the pipe wall can be avoided.

2) When the blades are closed, the sealing characteristic of the ventilation opening is ensured, and the outer frame is designed, so that the area of the ventilation opening of the outer frame is smaller than the whole area of the blades, and the edges of the blades are attached to the outer frame;

3) realize simultaneously, continuous regulation in the blade opening process, specifically be: the area of the ventilation opening can be continuously adjusted based on the shutter principle; based on the four-bar mechanism principle, the rotating shaft of one centered blade is taken as a driving shaft, the rotating shafts of the other blades are taken as driven shafts, and a connecting rod is designed to be hinged with each blade so as to realize that the motion form of the driving blade is transmitted to the driven blade.

4) The integral adjusting mechanism is designed to adapt to the profile of the pipe wall of the air inlet. Specifically, the edge profile of the blade is designed to be similar to the profile of the pipe wall of the air inlet, the outer frame profile of the adjusting mechanism is designed to be the profile of the pipe wall, the transmission rod is designed to be an upper part and a lower part, and the profile of each part is similar to the profile of the pipe wall of the air inlet.

The mechanism adopts the shutter principle, and when one blade is controlled to rotate, the other blades rotate at the same angle at the same time by a connecting rod transmission motion mode. Therefore, the scheme of adjusting the ventilation opening by the single plate is improved into the scheme of adjusting the ventilation opening by a plurality of blades, as shown in fig. 1, fig. 1 is a schematic diagram of a TBCC air inlet duct adjusting mechanism based on the shutter principle when the mechanism is completely opened, and the opening angle is an included angle between the plane of the ventilation opening 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 louver principle when it is completely closed.

As shown in FIG. 2, the left side of FIG. 2 is a schematic front view of a TBCC inlet duct adjusting mechanism based on the louver principle in a direction parallel to the wall of the inlet duct when the mechanism 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 of a TBCC inlet duct adjusting mechanism based on the louver principle in a direction parallel to the wall of the inlet duct when the mechanism is closed, and the right side of FIG. 3 is a schematic back view.

Fig. 4 is a schematic view of the opened back side of a TBCC air intake duct adjusting mechanism based on the louver principle, and fig. 4 is an exploded view of the TBCC air intake duct adjusting mechanism based on the louver principle. The mechanism consists of a transmission connecting rod 1, a blade 2, a shaft pin fixing sleeve 3, a rotating pin 4 and an outer frame 5.

The movement steps of the adjusting mechanism are as follows: when the ventilation opening is closed, the power system controls the rotation pins of the blades positioned at the center position in the blades to rotate, and the transmission connecting rod 1 transmits the motion form of the blades to other blades, so that all the blades can rotate simultaneously and continuously, and the ventilation opening is opened and closed.

As can be seen from fig. 2 and 3, the outer frame 5 designed by the present invention makes the inner elliptical area of the outer frame smaller than the entire area of the vanes, so that when the vanes are closed, the edges of the vanes are attached to the outer frame, and the sealing property of the ventilation opening when closed is ensured.

When the size of the blade is designed, the total area of the blade is designed to be smaller than the cross-sectional area of the pipe wall of the air inlet in order to prevent the blade from interfering with the pipe wall of the air inlet when the blade is opened to the position parallel to the axis of the air inlet.

In order to realize that the adjusting mechanism is more matched with the shape of the pipeline, the edge profile of the blade is designed to be a profile similar to the pipe wall of the air inlet, the outline of the outer frame of the adjusting mechanism is designed to be the pipe wall profile of the air inlet, the transmission rod is designed to be an upper part and a lower part, and each part of the outline is similar to the pipe wall profile of the air inlet.

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.