论文部分内容阅读
高空性是评价航空发动机齿轮泵性能的关键参数之一,为了获得摆线泵的高度特性曲线,并分析其影响因素,采用三维非定常数值模拟的方法,应用动网格技术对单级内啮合摆线齿轮泵的高空特性进行定量分析。结果表明:随着飞行高度增加,摆线泵内的空化现象加剧,供油流量减少;当飞行高度在8km以上时,容积效率随高度上升而急剧下降,且在相同的出口条件下,低转速摆线泵的容积效率明显高于高转速工况;当飞行高度在8km时,增大摆线泵出口压力,出口流量脉动幅度由时均流量的16%增至20%,且出口流量的脉动频率随摆线泵的转速加快而变大。所以,摆线泵在高空工作时,降低转速即可以满足供油需求,同时减少系统负担。
In order to obtain the height characteristic curve of the cycloidal pump and analyze the influencing factors, the method of three-dimensional unsteady numerical simulation is applied to the altitude performance to evaluate the performance of the aeroengine gear pump. The single-stage internal meshing Cycloidal gear pump height characteristics for quantitative analysis. The results show that as the flight altitude increases, the cavitation in the cycloidal pump aggravates and the flow of fuel decreases. When the flight altitude is above 8 km, the volumetric efficiency decreases sharply with the altitude rising, and under the same exit condition, When the flight altitude is 8km, the outlet pressure of the cycloidal pump is increased, and the fluctuation amplitude of the outlet flow rate increases from 16% of the average flow rate to 20%, and the outlet flow rate Pulse frequency with cycloid pump speed and become larger. Therefore, the cycloidal pump work at high altitude, reduce the speed to meet the oil demand, while reducing the system burden.