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Using an all-speed method to predict high frequency pressure spikes of water hammer with column separation
Darbandi, M ; Sharif University of Technology | 2015
604
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- Type of Document: Article
- Publisher: American Institute of Aeronautics and Astronautics Inc, AIAA , 2015
- Abstract:
- To extend a procedure to ensure the safe operation of a water reactor, we develop a numerical method to compute the high frequency pressure spikes of water hammer with liquid column separation in pipes. In this regard, we first extend a finite-volume all-speed method to solve the full one-dimensional Navier-Stokes equations. This method is capable of simulating gas and liquid phases as well as the vapor-liquid one. On the other hand, the current extended method should be capable of capturing high frequency pressure spikes, which are formed due to water hammer and column separation in pipes. The existence of such high frequency spikes has been recently reported experimentally by other researchers using high precision pressure transducers with 1 kHz frequency. To verify the accuracy of our achieved solutions, we compare them with those experiments. We have considered only one cavity adjacent to a control valve. Therefore, our modeling may be classified as a singlezone discrete vapor cavity method (single-zone DVCM). Although the classical DVCM methods mostly suffer from the excessive spurious pressure oscillations, our all-speed method is free from such oscillations. After ensuring the accuracy of the developed all-speed method, we simulate and analyze a real hydro-pneumatic system. To develop suitable correlations, we perform a number of measurements on the target system. Therefore, it helps us to incorporate such measurements with our developed method to provide more accurate simulations of water hammer with column separation. The achieved results show that the investigated system is exposed to failure risks
- Keywords:
- Energy conversion ; Liquids ; Navier Stokes equations ; Separation ; Water hammer ; Column separation ; Control valves ; High frequency HF ; High-precision ; Liquid columns ; Pneumatic system ; Pressure oscillation ; Target systems ; Numerical methods
- Source: 13th International Energy Conversion Engineering Conference, IECEC 2015, 27 July 2015 through 29 July 2015 ; July , 2015 ; 9781624103766 (ISBN)
- URL: http://arc.aiaa.org/doi/abs/10.2514/6.2015-4248