Peripheral multi-partition wake flow impact generator
A multi-partition and generator technology, which is applied in the direction of machines/engines, liquid fuel engines, and components of pumping devices for elastic fluids, can solve difficult problems with little improvement in compressor efficiency and low compressor insulation issues such as thermal efficiency
Inactive Publication Date: 2011-08-31
BEIHANG UNIV
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Problems solved by technology
[0004] However, the above-mentioned acoustic excitation and synthetic jet methods are very difficult in practical engineering applications; although the treatment of the casing can greatly improve the surge margin of the compressor, it is often at the expense of reducing the adiabatic efficiency of the compressor; The impingement generator has slightly improved the total pressure rise, efficiency and stall margin of the compressor in the experiment, but the improvement of the compressor efficiency is still very small
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[0021] The specific embodiment of the present invention is illustrated with examples. According to the design method of the wake impingement generator with multiple partitions in the circumferential direction of the inlet guide vane, design a wake generator with multiple partitions in the circumferential direction of the guide vane for a single-stage low-speed axial flow compressor, and verify its effect by experiments .
[0022] The main design parameters of the axial flow compressor are shown in Table 1.
[0023] Table 1 Main Design Parameters of Axial Flow Compressor
[0024]
[0025] First, determine the design speed n by experiment d = Rotor blade vortex shedding frequency at 3000rpm. It is determined by experiments that the compressor is at n d = Vortex shedding frequency f at 3000rpm shed for 1854H z . Then use the formula (1) to calculate the number of guide vanes as 37 pieces, which can be approximately taken as 40 pieces here. Then it can be seen from the ...
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The invention relates to a peripheral multi-partition wake flow impact generator of an inlet guide vane applied to an axial gas compressor. The wake flow impact generator comprises a case, a hub, four exciting areas with guide vanes and four buffer areas without the guide vane. The design of the invention takes flow loss of a strong and disordered unsteady multi-vortex structure in the gas compressor into consideration. When the number of the inlet guide vanes and a peripheral distribution mode are reasonably arranged, the multi-frequency wake of IGV (Inlet Guide Vane) generates a beneficial unsteady coupling excitation effect on a downstream rotor flow field. Compared with a wake flow impact scheme with peripherally distributed inlet guide vanes, the peripheral multi-partition wake flow impact scheme introduces proper low-frequency square-wave exciting signals and other beneficial auxiliary-frequency exciting signals while maintaining high-frequency exciting signals, so that the wake of the vanes can easily generate a coupling excitation effect with various vortex systems in the gas compressor. Therefore, the adiabatic efficiency of the gas compressor can be remarkably improved, the total pressure rise of the gas compressor is improved, and the stability margin of the gas compressor is enlarged.
Description
technical field [0001] The invention relates to a wake impingement generator with multiple partitions in the circumferential direction of an inlet guide vane, which can improve the thermal insulation efficiency of a compressor used in an aero-engine, and at the same time slightly increase the total pressure rise and stability margin of the compressor. Background technique [0002] At present, the impeller machinery industry has become a pillar of national economy and military power, and plays a leading role in national strategy. But those in the field know that there are strong and complex unsteady flows inside the compressor of an aeroengine. On the one hand, the mutual interference of the rotor / stator blades forms the unique unsteadiness in the compressor; on the other hand, there are various vortex structures and abundant secondary flows in the internal flow of the compressor. This strong and disordered unsteady flow greatly limits the further improvement of compressor p...
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Inventor 李志平袁巍李茂义陆亚钧周盛
Owner BEIHANG UNIV