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介绍了加氢精制装置循环氢离心压缩机变介质和变转速的换算过程,得出了多变压缩理论近似相似计算的结果. 相似文献
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给出了齿轮联轴器耦合转子-轴承系统的运动微分方程,并针对某国产DH型离心压缩机齿轮轴-齿轮联轴器-电机轴系统进行了动力学分析。数值结果表明,齿轮轴外伸端长度对轴承的负荷分配和系统的临界转速影响十分明显,而对系统的失稳转速则影响较小。当外伸端长度缩小为原长的一半时,DH型离心压缩机齿轮轴-齿轮联轴器-电机轴系统在轴承处的不平衡响应有增大的趋势。 相似文献
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针对目前离心压缩机损失模型的差异性,在总结离心压缩机叶轮损失模型的基础上,提出在计算各截面参数时采用多变系数替换绝热指数的方法.并利用MATLAB编写程序计算压缩机在不同流量和不同转速下的压比和效率.通过和单级离心压缩机性能实验数值比较,分析叶轮损失模型对压缩机性能的影响,得出了采用简化的叶轮损失模型对压缩机效率影响较大而对压比影响较小的结论. 相似文献
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低压离心压缩机系统喘振点的试验和计算 总被引:2,自引:1,他引:2
本文在一小型低压离心压缩机喘振试验台上,对不同转速、不同储气槽容积系统的喘振点进行了测量,并与以传统的小扰动理论为基础的集中参数模型所得计算结果进行了比较,依此讨论了部分参数对系统喘振点的影响。 相似文献
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离心式压缩机调速运行的节能率计算及优化 总被引:1,自引:0,他引:1
分析了天然气初加工系统中离心式压缩机的负荷特性,给出了离心式压缩机特性曲线的拟合方法及其调速运行时工况点的确定方法,在此基础上导出了离心式压缩机调速运行时节能率的计算公式.并建立了离心式压缩机调速运行时优化运行速度的数学模型。 相似文献
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给出了离心压缩机叶轮粘性尾迹速度亏缺值及尾迹宽度的计算方法。给出了离心压缩机气动参数和结构参数与声功率级之间的内在关系。提出了在叶轮粘性尾迹作用下,扩压器叶片上不稳定脉动力的计算式,运用调制理论,建立了离心叶轮与扩压器叶片相互作用而导致的声幅射方程。在此基础上,对某化肥厂DH63型离心压缩机声功率进行了理论计算,并与实测值进行了比较,二者吻合较好。 相似文献
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In compression systems, instability has long been an important issue. However, compared to axial machines, relatively little work has been done on the stability of centrifugal machines. Especially, many analytical models of stabilities have been developed to predict and control rotating stall, using compressor characteristic. However, stability models for centrifugal compressors are not scarce. Much research on compressor stability has focused on stalling flow coefficient and rotating stall phenomenon at the stalling flow coefficient. Given this situation, this paper presents a stability analysis of centrifugal compressors to predict rotating stall inception as well as the speed and number of cells. This analysis involves the use of compressor geometries, a steady compressor characteristic, and threedimensional flow analysis in the diffuser. The flow field perturbations at the axial inlet duct, impeller, and radial exit duct are determined via an eigenvalue analysis. The predictions are validated against experimental results from compressors with three different diffuser widths. The model accurately predicts the rotating stall inception flow coefficient. As the compressor characteristic becomes less steep with increasing diffuser width, the stalling flow coefficient increases. Also, experiment validates the model prediction that, depending on the dominant mode of flow perturbation, the number of rotating stall cells can be changed from three to two cells in the tested configurations. Furthermore, the cell speed increases as the flow coefficient decreases for a given number of stall cells. However, when the stall cell number is reduced, the cell speed decreases. 相似文献
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ZHU Xiaocheng GUO Qiang DU Zhaohui CHEN Hua ZHAO Yan 《机械工程学报(英文版)》2008,21(3):76-83
Unsteady flows and rotating stall of a low-speed centrifugal compressor are investigated by measuring vaneless diffuser wall static pressure fluctuation and internal flow fields at different small flow fluxes. During the experiment, firstly the real time static pressure fluctuations on the vaneless diffuser shroud at different circumferential and radial position were acquired by high-frequency dynamic pressure transducers. Discrete Fourier transformation analysis and cross-correlation analysis were applied to the experimental results to ascertain the rotating stall beginning operation conditions and stall cells numbers and rotating speed. Secondly, the vaneless diffuser inlet flow angle distribution along diffuser width direction was acquired by single hotwire, which was compared with SENOO's analysis results. At last, the internal flow fields of the centrifugal compressor were investigated with a particle image velocimetry (PIV) system at different small flow fluxes. The flow field development of vaneless diffuser and blade flow passage are given at rotating stall conditions. The experiments enrich the understanding of rotating stall flow phenomenon of the low-speed centrifugal compressor and provide full experiment data for designing high performance centrifugal compressor. 相似文献
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离心式压缩机由于内部静、动叶片排的相对运动,气流在压缩机内部流动时会产生动静干涉,从而会产生不定常气流激振力和高振幅压力脉动。这种非定常动静干涉对压缩机的稳定正常运行和实际工作效率有着重要的影响。为了有效研究动静干涉的信号特征,首先,对某模型级压缩机试验台离心叶轮进行运行模态仿真计算从而得到叶轮干涉图;其次,确定进口导叶(inlet guide vanes,简称IGV)和出口扩压器(outlet guide vanes,简称OGV)对叶轮存在干涉的转速;最后,在确定的试验转速工况下进行应变测试和压力脉动测试。通过分析对比,验证了仿真转速工况下干涉特征频率的存在,也证实了应变信号更适用于识别干涉信号特征。通过总结干涉较严重的转速工况干涉特征频率与叶轮固有频率的关系,为离心压缩机进一步改进设计奠定了基础。 相似文献
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离心式压缩机作为一种速度式压缩机,具有流量大,转速高,结构紧凑,运转可靠,易损件少等优点,但同时存在喘振及高转速下的振动等问题。对此,从喘振控制及运行振动控制两方面进行了分析与探讨。 相似文献