Active cooling ground test system for aircraft engine, and assessment method based on active cooling ground test system

Abstract

The invention provides an active cooling ground test system for an aircraft engine, and an assessment method based on the active cooling ground test system. The test system comprises a control system,a measurement system, an oil supply system and an electric heating element with a fuel oil flow channel, wherein the electric heating element is used for simulating a single active cooling channel ofthe aircraft engine; the oil supply system is used for supplying oil to the electric heating element; the control system is used for controlling the electric heating element to be electrified, and storing and collecting test data; the measurement system is used for measuring the temperature of the electric heating element, the temperature of the fuel oil and the like; and in addition, the side wall, which is used for simulating a direction which faces the wall surface of a combustion chamber of the aircraft engine, of the electric heating element adopts non-uniform variable thickness design in a fuel oil flow channel direction. By use of the test system, the along-the-way thermal flux density distribution situation of the cooling channel of the active cooling engine can be more truly simulated, a ground thermal environment with high accuracy is provided for the evaluation and assessment research of the cooling structure of the active cooling engine and heat absorption type fuel, and in addition, the active cooling ground test system is convenient to operate, is low in cost, does not generate additional pollution, and is suitable for engineering application.

Description

technical field [0001] The invention relates to the technical field of active engine cooling, in particular to an aircraft engine active cooling ground test system and an assessment method based thereon. Background technique [0002] Aerospace aircraft engines work under extreme thermophysical conditions of high-speed, high-temperature, and high-intensity combustion, and the temperature in the combustion chamber can reach more than 3000K. The current most advanced high temperature resistant materials C / C and SiC composites have a heat resistance temperature of only about 2400K. Therefore, the development of advanced cooling technology, such as active cooling technology, is particularly important. Active cooling refers to a cooling method in which all or most of the heat is taken away by the working fluid or cooling flow. After numerical calculation research and experimental verification, active cooling has been proved to be an effective thermal protection scheme. [0003]...

AI Technical Summary

Problems solved by technology

Among the existing engine ground test methods, free jet test and direct connection test are more accurate, but their cost is high, the duration is short and difficult to control, and they are not suitable for engineering applications; although the cost of radiation heating test bench is relatively low, but the radiation heating The heating and temperature rise process is relatively long, and it is not easy to change the test conditions in a controlled manner, and the system has a large hysteresis; another fuel evaluation method often used in the active cooling ground test system of aircraft engines is as follows: Figure 10 Although the cost of the uniform section electric heating method shown is relatively low, the section of the pipe does not change. Therefore, the heat flux on the upper and lower walls and the left and right walls are respectively the same, and the heat flux along the process is uniform and constant. This test method cannot Simulate the four walls of the active cooling channel of the scramjet and the heat flux distribution along the process more realistically

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