A Turbine Experimental Device with Adjustable Pitch

Abstract

An adjustable-distance turbine experimental device includes an experimental section. The experimental section includes two parallel side plates with a certain distance. The top and one side of the two side plates are closed, and an adjustable distance device is installed on the other side. The bottom of one side and the bottom of the two side plates are the outlet of the test section, the test cascade is installed between the two side plates, the outlet of the compressor is connected to the inlet of the adjustable distance device through the pipeline, and the outlet of the adjustable distance device faces the test cascade , along the airflow direction, the adjustable distance device includes a shrinking tube and an adjusting tube, wherein the shrinking tube is located at the inlet, and its shrinking angle is adjustable. One end of the adjusting tube is connected to the shrinking tube, and the other end faces the test cascade. The invention can economically and conveniently adjust the inlet flow area and airflow radial velocity distribution of the experimental section of the turbine test bench, and meet the test measurements of different types of cascades (guide vanes and moving blades), different pitches of cascades, and different inlet airflow angles. Require.

Description

technical field [0001] The invention belongs to the technical field of gas turbine aerodynamic heat transfer and comprehensive cooling, in particular to a turbine experiment device with adjustable pitch. Background technique [0002] Gas turbine is one of the main thermal power conversion equipment in the field of turbomachinery. Improving its thermal power conversion efficiency is of great significance for improving energy conversion efficiency and overall productivity. In order to improve the thermal efficiency of gas turbines, the inlet temperature of gas turbines continues to increase, far exceeding the melting point (1000°C) of current turbine blade materials (single crystal nickel-based alloys). As society pays more and more attention to environmental protection, the outlet temperature of the environment-friendly combustor is more evenly distributed in the radial direction, which further increases the heat load on the end wall of the gas turbine cascade. Therefore, in...

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Problems solved by technology

[0003] At present, gas turbine test benches for mechanistic research at home and abroad can only conduct measurement tests on a certain fixed-pitch cascade after the construction is completed. If you want to replace the cascade with a different pitch for measurement experiments, you must redesign and Replacing the air section to adapt to the new pitch cascade will undoubtedly significantly increase the time cost and test economic cost

In addition, the existing gas turbine test bench can only measure and test the guide vane or moving blade, and cannot meet the air intake requirements of the guide vane and moving blade cascade channels at the same time, as well as tests with different pitches of the guide vane and moving blade cascade The research on the flow and heat transfer characteristics of gas turbine hot end components (guide vanes and moving vanes) cannot be carried out systematically

At present, there is no experimental device that can economically and conveniently adjust the inlet flow area of ​​the test section of the gas turbine test bench to meet the test and measurement requirements of different pitch cascades, guide vanes and moving vanes

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