CAJ | 학술논문

作为离心泵的一种演变泵型,燃油汽心泵在航空发动机中应用前景良好,叶轮区形成的汽心对泵的工作状态和性能影响较大。基于 RNGκ-ε湍流模型对汽心泵内流场进行了非定常汽液两相数值模拟,研究了进口节流活门开度与出口负载对汽心区域的影响规律。为验证数值模拟结果的精度,利用汽心泵样机开展了基本特性试验。结果表明,汽心泵内燃油汽化发生于叶轮进口端；汽心区域随出口负载减小逐渐扩张。扩张至叶片区后,燃油全部从叶片压力面一侧流道进入蜗室；其他工况不变时汽心区随节流活门开度减小而迅速扩张,2 mm 开度时泵的效率最低可降至20％以下。数值模拟与样机试验误差基本在10％以内。
작위리심빙적일충연변빙형,연유기심빙재항공발동궤중응용전경량호,협륜구형성적기심대빙적공작상태화성능영향교대。기우 RNGκ-ε단류모형대기심빙내류장진행료비정상기액량상수치모의,연구료진구절류활문개도여출구부재대기심구역적영향규률。위험증수치모의결과적정도,이용기심빙양궤개전료기본특성시험。결과표명,기심빙내연유기화발생우협륜진구단；기심구역수출구부재감소축점확장。확장지협편구후,연유전부종협편압력면일측류도진입와실；기타공황불변시기심구수절류활문개도감소이신속확장,2 mm 개도시빙적효솔최저가강지20％이하。수치모의여양궤시험오차기본재10％이내。
As a variant of centrifugal pump,fuel VCP shows good application prospects in aero en-gines.The vapor core generating in impeller region had great influences on operation status and per-formance of VCP.Unsteady numerical simulation of VCP was presented herein based on RNG (renor-malization group)κ-ε turbulence model and vapor-liquid two-phase cavitation model.Effects of inlet throttle opening and outlet load on vapor core region were studied.In order to verify the reliability of numerical results,basic characteristics of a prototype pump were tested.Results show that fuel vapor-ization inside the pump occurs at the impeller inlet.The vapor core region gradually expands with the decreasing outlet pressure.When expanding to the blade region,liquid fuel flows into the volute from the pressure side of blade.Other conditions being unchanged,vapor core region rapidly expands when reducing the throttle opening.Efficiency of the VCP is less than 20% at 2 mm throttle opening.The simulation and test errors are within 10%.