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为保证往复活塞式压缩机的运行可靠性和经济性,必须通过冷却系统对其进行良好的冷却。针对不同类型的压缩机,对风冷式压缩机和水冷式压缩机的冷却系统的组成、特点、设计原则分别进行了阐述。进而对压缩机冷却系统在冷却器等方面的研究和改进的进展情况作了介绍。 相似文献
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喘振是离心式压缩机固有的特性,它是在一定的操作条件下,由被压缩气体的气流扰动引起的一种非正常现象。本文介绍了离心式压缩机的喘振原理及喘振控制,并结合喘振现象和喘振试验对压缩机的喘振原因进行了分析。针对压缩机组解体检查中发现的问题,采取了相应的防范措施,消除了压缩机的喘振现象,确保了机组的长周期稳定运行。 相似文献
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The thermodynamic analysis and parametric study of an intercooled–reheat closed-cycle gas turbine is presented in this paper, on the basis of a new (harmonic mean) isentropic exponent. An analytical expression is derived for the optimum pressure ratio and maximum non-dimensional net work output. It is found that the optimum pressure ratio and the maximum non-dimensional net work are high when the ratio of extreme temperatures of cycle (i.e. T max and T min) and isentropic efficiencies of compressor and turbine (i.e. ηc and ηt) are high. The theoretical results are also compared with the practical conditions of power plant. 相似文献
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The present study was aimed to utilize low‐cost alumina (Al2O3) nanoparticles for improving the heat transfer behavior in an intercooler of two‐stage air compressor. Experimental investigation was carried out with three different volume concentrations of 0.5%, 0.75%, and 1.0% Al2O3/water nanofluids to assess the performance of the intercooler, that is, counterflow heat exchanger at different loads. Thermal properties such as thermal conductivity and overall heat transfer coefficient of nanofluid increased substantially with increasing concentration of Al2O3 nanoparticles. Specific heat capacity of nanofluids were lower than base water. The intercooler performance parameters such as effectiveness and efficiency improved appreciably with the employment of nanofluid. The efficiency increased by about 6.1% with maximum concentration of nanofluid, that is, 1% at 3‐bar compressor load. It is concluded from the study that high concentration of Al2O3 nanoparticles dispersion in water would offer better heat transfer performance of the intercooler. 相似文献
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Thermodynamic studies of a HAT cycle and its components 总被引:1,自引:0,他引:1
The electric power grid contains more and more renewable power production such as wind and solar power. The use of renewable power sources increases the fluctuations in the power grid which increase the demand for highly efficient, fast-starting power-producing units that can cope with sudden production losses. One of the more innovative power plant cycles, that have the potential of competing with conventional combined power plants in efficiency but has a higher availability and faster start up time, is the Evaporative Gas Turbine (EvGT) or Humid Air Turbine (HAT). A thermodynamic evaluation of different HAT cycle layouts has been done in this paper. Each layout is evaluated separately which makes it possible to study different components individual contribution to the efficiency and specific power. The thermodynamic evaluation also shows that it is important to look at different cool-flow extracting positions. The effect of water temperature entering the cycle, called make-up water, and where it is introduced into the cycle has been evaluated. The make-up water temperature also affects the optimal pressure level for intercooling and it is shown that an optimal position can be decided considering design parameters of the compressor and the water circuit. 相似文献
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增压器和中冷器联合性能试验台 总被引:1,自引:0,他引:1
增压器和中冷器是柴油机增压系统的重要部件 ,其性能的优劣直接影响柴油机的经济性、动力性及可靠性。目前 ,我国机务部门已经实现了增压器的集中修理 ,并有完备的性能试验设备 ,但对中冷器的性能试验还缺乏必要的设备 ,这使装车运用的中冷器质量难以得到保证。为此 ,提出了建造增压器、中冷器联合试验台方案 ,它具有投资少 ,试验费用低 ,维修保养方便等优点。 相似文献
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散热器、中冷器和风扇的选型校核计算 总被引:1,自引:0,他引:1
王兆煖 《柴油机设计与制造》2009,16(4):20-31
介绍散热器、中冷器和风扇的选型要点,推荐一种选型校核计算方法,包括了校核计算所需的参数、选型校核计算步骤、校核计算用散热量以及总风阻、风扇实际风量、散热器的不同风阻部分冷却空气流速和比冷却能力的确定方法等,可供从事这方面研究的工程技术人员参考。 相似文献