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为了研究以国产大庆RP-3航空煤油为流动介质的航空燃油泵内部空化特性,采用数值模拟的方法研究了高温低压环境下航空燃油泵内部的空化流动.针对航空煤油这种成分复杂的介质,引入替代燃料的概念,选择摩尔分数为74.5%的正十二烷、10%的甲基环已烷、10%的甲苯和5.5%的辛烷构成的四组分替代燃料模拟大庆RP-3航空煤油.计算中采用基于旋转修正的k-ε湍流模型以及Zwart-Gerber-Belamri空化模型,基于实验结果对数值方法进行了验证分析.研究结果表明:基于替代燃料和旋转修正的k-ε湍流模型的数值计算方法能够较准确地预测航空燃油泵的空化特性;忽略大庆RP-3航空煤油空化热力学效应,温度对航空燃油泵空化性能有一定影响,在80℃工况下,航空燃油泵空化性能较差;转速对航空燃油泵空化性能影响较大,航空燃油泵在转速为10 000r/min工况下空化比转速最大,空化性能最好.
In order to study the internal cavitation characteristics of the aviation fuel pump which is made by the domestic Daqing RP-3 aviation kerosene, numerical simulation is used to study the cavitation flow inside the aviation fuel pump under the conditions of high temperature and low pressure. Medium, the concept of introducing alternative fuels, a four-component alternative fuel consisting of 74.5% of n-dodecane, 10% of methylcyclohexane, 10% of toluene and 5.5% 3 aviation kerosene, k-ε turbulence model based on rotation correction and Zwart-Gerber-Belamri cavitation model are used in the calculation, and the numerical method is validated and analyzed based on the experimental results.The results show that the k- ε turbulence model can accurately predict the cavitation characteristics of the aviation fuel pump. Ignoring the thermodynamic effect of the ku-RP-3 aviation kerosene, the temperature has some influence on the cavitation performance of the aviation fuel pump. Under the condition of 80 ℃ , Aviation fuel pump cavitation performance is poor; speed on the performance of aviation fuel pump cavitation greater impact, aviation fuel pump at the speed of 10 000r / min conditions cavitation than the maximum speed, the cavitation performance .