Critical inlet pressure (CIP) is a key parameter for ensuring the long life and steady operation of aircraft piston pumps. In the past, this parameter was determined through experimental methods that had drawbacks such as a long duration and narrow application range. To identify an alternate approach that can be substituted for the traditional approach, a numerical model for determining the CIP that considers the dynamic effects of the transient period is proposed in this paper. First, a dynamic model of the pressure-controlled piston pump was established in the form of differential equations based on the lumped parameter method. Next, the fluid model for vapor cavitation and air aeration was derived using homogeneous mixture theory with consideration of the effects of compressibility of both liquid and gaseous phases. Simulation investigation highlighted how the shaft speed, inlet pressure, and transient time influence the fluid properties inside the piston chamber, and a method for determining the CIP both for steady and transient conditions is presented. Finally, tests were conducted on an aircraft piston pump in open-circuit applications for verifying the applicability of the proposed numerical model.

中文翻译：

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首次尝试使用考虑蒸汽空化和空气曝气的数值方法确定飞机泵的临界入口压力

临界入口压力（CIP）是确保飞机活塞泵长寿命和稳定运行的关键参数。过去，该参数是通过实验方法确定的，存在持续时间长、适用范围窄等缺点。为了确定可以替代传统方法的替代方法，本文提出了一种用于确定 CIP 的数值模型，该模型考虑了瞬态周期的动态影响。首先，基于集总参数方法以微分方程的形式建立了压力控制柱塞泵的动力学模型。接下来，考虑到液相和气相的可压缩性的影响，使用均质混合物理论推导出蒸汽空化和空气曝气的流体模型。仿真研究强调了轴速、入口压力和瞬态时间如何影响活塞腔内的流体特性，并提出了一种确定稳态和瞬态条件下 CIP 的方法。最后，在开路应用中对飞机活塞泵进行了测试，以验证所提出的数值模型的适用性。