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为研究微小型涡轮喷气发动机风车起动的特性,以某微型涡轮喷气发动机为原型,通过数值模拟和试验研究相结合的方法,研究了其风车起动过程的各种特性。通过试验研究了丙烷气点火时间和丙烷气压对微型涡喷发动机转速以及燃烧室温度的影响规律,以在最短时间内使得微型涡喷发动机转速和燃烧室温度满足可供油燃烧的条件,并确定所需要的丙烷气最小气量。结果表明:在本试验条件下发动机从起动到慢车状态过程中,以先快后慢的供油规律起动加速时间最短约为82 s;发动机从慢车到80%全转速状态过程中,实现相对最短加速时间的供油规律可分为2段,前段供油斜率较大为0.79,后段供油斜率较小为0.14。对其它结构形式和起动过程类似的微小型涡轮喷气发动机有一定借鉴作用。
In order to study the characteristics of wind turbine start-up for a micro-turbojet engine, a micro-turbojet engine is used as a prototype to study various characteristics of the wind turbine starting process through a combination of numerical simulation and experimental research. The influence of propane gas ignition time and propane pressure on the rotational speed of micro-turbojet engine and the temperature of the combustion chamber was studied through experiments. The micro-turbojet engine speed and combustion chamber temperature were satisfied for the oil combustion conditions in the shortest time, The minimum amount of propane gas required. The results show that the starting acceleration time of the engine with cranking speed and slow speed is the shortest about 82 s under the condition of starting from the engine to the idle state. When the engine runs from idle to 80% of full speed, the relative shortest acceleration Accelerating time of the oil supply law can be divided into two sections, the front section of the fuel supply slope is greater than 0.79, the latter part of the slope of the smaller supply of 0.14. For other structures and starting process similar to the tiny turbojet engine has a certain reference.