外啮合齿轮机泄漏流量及瞬时齿隙压力的研究

Rituraj, Thomas Ransegnola, A. Vacca
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引用次数: 3

摘要

外啮合齿轮机(egm)用于各种行业,从流体动力机械到流体输送系统和燃油喷射应用。为了了解这些装置的性能和运行的动态特性,过去已经开发了几种仿真工具。其中一些工具基于集总参数方法,这对于快速设计研究和优化非常有用。然而,这些模型大多是基于“先验”的假设,特别是关于泄漏流的流动状态。内部泄漏不仅决定了EGM的容积效率,而且还影响了齿轮上的实际压力载荷。对于齿轮齿尖处的泄漏流,通常考虑简单的层流假设,但正如本文所示,对于某些EGMs,该假设是无效的,并且观察到齿尖处的湍流影响。本文的目标是提出一种快速集总参数方法来模拟egm的齿尖泄漏流,适用于广泛的操作条件。提出的模型考虑了紊流条件的发生以及入口压降,考虑了现有已发表的工作和CFD模拟。为了显示真实的仿真,所提出的模型在作者团队多年来开发的液压齿轮机模拟器(HYGESim)中实现。将该模型应用于某参考泵的齿隙、体积增压和泄漏流研究,验证了该模型的重要性。
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An Investigation on the Leakage Flow and Instantaneous Tooth Space Pressure in External Gear Machines
External gear machines (EGMs) are used in a variety of industries ranging from fluid power machinery to fluid transport system and fuel injection applications. To gain understanding of the performance and dynamic characteristics of operation of these units, several simulation tools have been developed in past. Some of these tools are based on lumped parameter approaches, which are useful for fast design studies and optimizations. However, most of these models are based on “a priori” assumptions, particularly as concerns the flow regime of the leakage flows. Internal leakages not only determine the volumetric efficiency of an EGM, they also affect the actual pressure loading on the gears. A simple Iaminar flow assumption is usually considered for the leakage flow at the tooth tip of the gears, but as this paper will show, for certain EGMs this hypothesis is not valid, and effects of turbulence at the tooth tip are observed. The goal of this paper is to propose a methodology for fast lumped parameter approaches to model the tooth tip leakage flow in EGMs, applicable for a broad range of operating conditions. The proposed model considers the occurrence of turbulent flow conditions as well as the entrance pressure drop, with considerations based on existing published work and CFD simulations. In order to show realistic simulation, the proposed model is implemented within the HYdraulic GEar machines Simulator (HYGESim), developed by the authors’ team over the past years. The proposed model is then used to study the tooth space volume pressurization and leakage flow on a reference pump working with Jet A-l fuel, showing the importance of the proposed modeling approach.
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