Research Institute of Engineering Thermophysics, Biaxial Compressor Test Platform, Radial Air Intake System
The high performance air intake system is a necessary condition for the efficient and stable operation of the compressor. The radial air intake system is widely used in the situation where the compressor inlet is blocked in the axial direction. However, due to its poor air intake quality, the performance needs to be improved. In recent years, attention has been paid to scholars at home and abroad. At present, there are fewer means to improve the air intake system quality of the radial air intake system, the effect is not good, and the applicable flow range is narrow.
The Institute of Engineering Thermophysics, Chinese Academy of Sciences, is developing a test platform for double-shaft double-cage-to-compressor testing using a radial air intake system. The platform air intake system needs to be able to provide high quality air inlet flow field under a wide range of working flow (2~20 kg/s) under the constraint of more geometric conditions. Its development and engineering design is a test platform. The difficulties and priorities of the project are related to the success or failure of the development of the experimental platform.
The conventional method is to add flow guiding ribs. The related research indicates that the smaller the angle of attack of the leading edge of the guiding ribs is, the more favorable it is for the outlet to be uniform. Therefore, this method can only perform better in a narrower flow range. Since the test platform must meet the test requirements of multiple test pieces, the air intake system needs to perform well in the full flow range, so the method of adding the flow guide ribs is not applicable.
To solve this problem, test bench developers innovatively introduced the honeycomb into the intake scroll. The application of the honeycomb is more common in the intake system, but it is usually placed in the straight section of the plenum using its current sharing effect. In fact, the honeycomb also has a guiding role, but this is not obvious in the straight section. The air flow in the inlet volute flows from the radial local air inlet to the axial full-circumference exhaust gas, which requires the air flow to be folded at an angle and evenly distributed. Through multi-wheel scheme discussion and design analysis, it is determined that the volute inlet air intake line and the honeycomb are optimized. The combination of disk layouts to achieve design requirements. The overall structure is shown in Figure 1. The volute and honeycomb are shown in Figure 2 and Figure 3. The simulation analysis results show that the honeycomb fully exerts the role of guiding air flow and uniform distribution in the air intake system. The newly designed air intake system has a significantly reduced outlet air flow angle, less than 1 degree in the full flow range, a total pressure non-uniformity of less than 6%, and a total pressure recovery coefficient greater than 98%, as shown in FIG. 4 . The test intake air requirement can be met in the full flow range.
At present, the air intake system has been processed and is undergoing installation and commissioning at the Research and Development Center in Langfang.
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