Ultrasonic and subsonic profile combination cascade for compressor

An ultrasonic blade and compressor technology, applied in mechanical equipment, machine/engine, liquid fuel engine, etc., can solve problems such as difficult design

Inactive Publication Date: 2009-04-29
BEIHANG UNIV
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Problems solved by technology

[0004] For the design of the stator with a large rotation angle of the incoming ultrasonic wave, if a conventional single-row cascade is used, it is necessary to achieve both shock wave deceleration and a large rotation angle, which is difficult to design

Method used

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  • Ultrasonic and subsonic profile combination cascade for compressor
  • Ultrasonic and subsonic profile combination cascade for compressor
  • Ultrasonic and subsonic profile combination cascade for compressor

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Embodiment Construction

[0013] The specific implementation steps for the design of supersonic and subsonic airfoil combined cascades are as follows:

[0014] Step 1: Given parameters such as flow channel, blade leading and trailing edge, and circulation distribution, conduct flow design in the stage environment, and obtain the distribution of meridian surface parameters including the air flow angle distribution in the stator area;

[0015] Step 2: According to the calculated airflow angle distribution, divide the axial boundary position of the front and rear rows, so that the change of the front exhaust flow angle is slightly smaller (less than 10°), and the change of the rear exhaust flow angle is slightly larger, and calculate the load distribution of the front and rear rows, and check before and after Whether the ratio of the exhaust pressure rise coefficient is between 1.8 and 2.2, if the deviation is large, it is necessary to return to step 1 to adjust the circulation distribution;

[0016] Step...

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Abstract

The invention relates to an ultrasonic and subsonic leaf type combined cascade of compressor, which is mainly designed according to the stator having inflow ultrasonic larger airflow rotation angle for high load compressor. The stator need to realize two functions of shock wave speed reduction and large airflow rotation angle at the same time, which can be realized with difficulty by conventional single row cascade. The invention realizes the two functions by the front and the rear row of cascades through the ultrasonic and subsonic leaf type combined cascade, namely the front row adopts ultrasonic leaf type to realize the shock wave speed reduction, and the rear row adopts subsonic leaf type to realize large airflow rotation angle. Optimal matching of the relative position of the front and the rear rows is performed, the front edge of the rear row in the circumferential direction is close to the front row pressure surface with a distance of 15-25% of cascade distance, and cascades in axial direction are not superposed or properly superposed, the wake of the front row can be well controlled at the rear row, the Mach number of rear row inflow is in proper range, the speed reduction and diffusion processes are smooth, thereby the combined cascade has better integral performance. The ultrasonic and subsonic leaf type combined cascade is suitable for inflow having Mach number of 1.0-1.5 and D factor of more than 0.7, and has better engineering application prospect.

Description

technical field [0001] The invention relates to an aeroengine compressor super-subsonic vane combined cascade, in particular to a super-subsonic vane combined vane cascade used for a high-load compressor incoming flow supersonic and large-rotation-angle stator. Background technique [0002] The main development trend of aero-engines is high thrust-to-weight ratio, that is, the constant pursuit of lighter weight and greater thrust of the engine. The compressor is one of the three major components of the engine, which performs the work of compressing the airflow. To achieve a high thrust-to-weight ratio of the engine requires the compressor to use fewer stages to achieve the high pressure ratio, so a high load development requirement is put forward for the compressor. [0003] The rotor of the compressor realizes the addition of work to the airflow by making the airflow generate a circumferential velocity; while the stator diffuses the airflow, and at the same time reduces th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/40
Inventor 李秋实李绍斌吴宏周盛陆亚钧
Owner BEIHANG UNIV
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