• Title/Summary/Keyword: 벌류트케이싱

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Burst Test of Volute Casings for Liquid Rocket Turbopump (액체로켓 터보펌프 벌류트 케이싱의 파열시험)

  • Yoon, Suk-Hwan;Jeon, Seong-Min;Kim, Jin-Han
    • The KSFM Journal of Fluid Machinery
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    • v.14 no.4
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    • pp.12-18
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    • 2011
  • Volute casings for liquid rocket turbopump are designed and evaluated in a structural point of view. At the design step 3D modeling and finite element analyses are conducted iteratively. During the step various loads such as internal pressure, casing stiffness and mounting forces are considered in the analyses, along with the weight minimization effort. After the design step volute casings are manufactured by metal casting process, and then they are subjected to burst test for structural verification. In the burst test strains at several points are measured and compared with predicted values.

Influence of Circualr Casing on the Performance of Very Low Specific Speed Centrifugal Pump (원형케이싱이 극저비속도 원심펌프의 성능에 미치는 영향)

  • Choi, Young-Do;Kagawa, Shusaku;Kurokawa, Junichi
    • The KSFM Journal of Fluid Machinery
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    • v.9 no.1 s.34
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    • pp.32-39
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    • 2006
  • Recently, according to the trend of small size in scale and high speed in rotation of turbomachinery, very low specific speed centrifugal pump is taking a growing interest because the pump is characterized by high head and low flow rate with convenience of manufacturing and maintenance compared with conventional positive displacement pump. However, the efficiency of the very low specific speed centrifugal pump drops rapidly with the decrease of specific speed. The purpose of this study is nor only to examine the influence of casing type on the performance of centrifugal pump in the range of very low specific speed but also to determine the proper casing type for the improvement of pump performance. The results show that circular casing is suitable for the centrifugal pump in the range of very low specific speed and the influence of impeller configuration on the pump performance is very small. Radial thrust in the circular and volute casings is considerably small in the range of very low specific speed.

Experimental Study on the Blade Excitation Frequency for the Natural Frequence of Centrifugal Pump Piping Systems (원심펌프 배관계 진동에 영향을 주는 블레이드 가진주파수의 실험적 고찰)

  • 김윤제;신호길
    • Journal of Energy Engineering
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    • v.10 no.4
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    • pp.335-341
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    • 2001
  • Pressure pulsations generated by the blade-tongue interaction induce vibration of the piping systems and the structure connected to pumps, resulting in the severe noise and fatigue fracture. Experiments were made on the natural frequencies of liquid columns in piping systems with a single suction, single stage, centrifugal volute pump. Experimental results show that the natural frequencies of the liquid columns in the pump piping systems depend on the dimensions of the pipes and the impeller shapes, and are not affected substantially by the rate of discharge and the rotating speed of the pump.

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