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涡轮冷却器动态特性研究 总被引:2,自引:0,他引:2
应文江 《南京航空航天大学学报》1994,26(2):230-236
从飞机空调的温度控制系统设计的需要出发,首先用理论推导的方法求得涡轮冷却器的动态数学模型的结构形式,然后提出不用理论推导的方法求得涡轮冷却器动态数学模型的模型参数,而用辨识实验的方法求得涡轮冷却器的动态数学模型的模型参数。还推导了辨识的计算公式,论述了辨识实验的方法、步骤和结果。最后提出了涡轮冷却器动态特性的计算方法,并且以欧拉法为例论述了涡轮冷却器动态特性计算的具体公式和步骤。 相似文献
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运用CFD数值计算和平面叶栅的吹风试验对蒸汽涡轮导向叶片的端墙效应进行了研究,并在一试验蒸汽涡轮上得到了验证。由于本文研究给出了较高的效率,进一步实施了大量的三维数值模拟,该结果显示使用这一叶型对涡轮有一定的改善,尤其在涡轮叶片尖部有端墙时。在试验蒸汽涡轮上测量了尖部、根部均有端墙和仅尖部有端墙的不同效应,结果表明尖部有端墙时效率有所提高,然而当叶片有直端墙时,效率反而会下降。 相似文献
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低压蒸汽透平排汽缸内能量损失的数值研究 总被引:12,自引:0,他引:12
运用三维粘性流场数值模拟软件(Fine/Turbo)对一个低压蒸汽透平排气缸内的复杂流动进行数值模拟,计算结果与已有的实验数据进行了对比.计算得到的排气缸出口截面上的质量平均总压损失为47.8%,实验值为40.9%.数值模拟清晰地显示了排气缸通道内的流场结构是以各种旋涡为主要特征,包括通道涡、分离涡和端壁涡等.其中,通道涡的尺度最大,是造成排汽缸内能量损失的最主要因素. 相似文献
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An experimental investigation is conducted to obtain the heat transfer and pressure drop data for an integral trailing edge cavity test section that simulates a novel turbine blade's internal cooling passage with bleed holes. Local heat transfer is measured on both the suction and pressure sides by a transient liquid crystal technique, while pressures at six positions are recorded by pressure calibrators. Moreover, flow characteristic and its effect on heat transfer are analyzed for conditions with or without bleed flow. The experimental results show that, in the cases with bleed flow, local heat transfer on the pressure side exceeds that on the suction side in the first and second channels. In the cases without bleed flow, in the first and third channels, local heat transfer on the suction side weakens whilst it increases significantly on the pressure side. For the second channel, non-bleed condition leads to a more balanced heat transfer distribution between the upstream and downstream channel. Besides, after the bleed holes are blocked, heat transfer in the first bend region on the suction side declines sharply, while the opposite phenomenon occurs for the second bend region on the pressure side. In both bleed and non-bleed cases, the total pressure of six measurement positions decreases continuously along the channel at the same Reynolds number and it promotes for higher Reynolds number. Among all the measurement points, under the same flow rate condition, the highest speed occurs at Position 5, which also shows the maximum difference between the total and static pressures. When the bleed holes are blocked, the total pressure at each measurement position appears to increase. 相似文献
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Influence of pre-tension on ballistic impact performance of multi-layer Kevlar 49 woven fabrics for gas turbine engine containment systems 总被引:1,自引:0,他引:1
In this paper, ballistic impact tests on wrapped multi-layer Kevlar 49 woven fabric systems were carried out with a flat blade projectile to investigate the impact response during a fan blade out event. The influences of the number of Kevlar layers and pre-tension were discussed particularly. Test results were used to analyze failure modes and energy absorption characteristics of multi-ply Kevlar fabrics. Results show that there are two kinds of impact damage for fabrics: global deformation mainly involving stretching of yarns in the impact region and fabric wrinkle from both sides to the impact zone, and local damage characterized by yarn fracture, yarn pull-out, and yarn unraveling. The energy absorption capability of Kevlar 49 woven fabrics improves with the number of fabric layers. The energy absorbed by multi-layer fabrics increases slightly at the beginning and then decreases substantially with pre-tension. The work in this paper can provide guidance for designing light-weight multi-layer fabrics containment systems. 相似文献
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