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首页> 外文期刊>Mechanical systems and signal processing >Transient flow analysis in a Roots blower: Experimental and numerical investigations
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Transient flow analysis in a Roots blower: Experimental and numerical investigations

机译：罗茨风机的瞬态流量分析：实验和数值研究

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It is widely acknowledged that rotary positive displacement machines exhibit highly unsteady flow fields that affect their performance. The presence of the operational clearances impacts this unsteady flow field and further affects the performance. However, the exact nature of these unsteady flow mechanisms remains largely unknown that necessitates both detailed experimental investigations and computational modelling. Thus, the present study employs both optical visualization and unsteady Reynolds-Averaged Navier Stokes (URANS) computational modelling methods while focussing on investigating the transient flow field inside a Roots blower, a general type of the rotary positive displacement machine. Straight lobes in a Roots blower provide convenient optical access to experimentally analyse internal flow and compare it with the predictions obtained by standard computational models. In the first part of this paper, this study covers the low-speed experimental investigations using ⅰ) High-Speed Camera (HC), ⅱ) the continuous High-Speed Particle Image Velocimetry (CPIV) and, ⅲ) the instantaneous PIV (IPIV) obtained with a double pulse laser and a double shutter camera. Relative merits from these techniques are discussed with respect to the Roots blower unsteady flow mechanisms. In addition, computational analyses are performed using a combination of in-house and commercial modelling methods and the results are compared against the experiments. The results confirm the existence of highly three-dimensional and unsteady flow field where certain distinct flow mechanisms originating from the operational clearances impact the performance of the Roots blower. The study also highlights challenges of the experimental and computational methods used for evaluation of positive displacement machines that impact the accuracy of results.
机译：众所周知，旋转正排量机表现出影响其性能的高度不稳定的流场。操作间隙的存在会影响该不稳定的流场并进一步影响性能。但是，这些不稳定流动机制的确切性质仍是未知之数，这需要详细的实验研究和计算模型。因此，本研究采用光学可视化和不稳定的雷诺平均纳维斯托克斯（URANS）计算建模方法，同时着重研究罗茨鼓风机内部的瞬态流场，罗茨鼓风机是旋转正排量机器的常规类型。罗茨鼓风机中的直瓣提供了方便的光学通道，可以通过实验分析内部流量并将其与标准计算模型获得的预测进行比较。在本文的第一部分中，本研究涵盖了使用ⅰ）高速相机（HC），ⅱ）连续高速粒子图像测速仪（CPIV）和，）瞬时PIV（IPIV）进行的低速实验研究）由双脉冲激光和双快门相机获得。针对罗茨鼓风机的非稳态流动机理，讨论了这些技术的相对优点。此外，使用内部和商业建模方法的组合进行计算分析，并将结果与​​实验进行比较。结果证实了存在高度三维的非恒定流场，其中某些源自运行间隙的独特流场会影响罗茨鼓风机的性能。这项研究还强调了用于评估正位移机的实验和计算方法的挑战，这会影响结果的准确性。

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