Dynamic behaviour of direct spring loaded pressure relief valves in gas service: II reduced order modelling |
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| Institution: | 1. Department of Hydrodynamic Systems, Budapest University of Technology and Economics, 1111 Budapest, M?egyetem rkp. 3, Budapest, Hungary;2. Department of Engineering Mathematics, University of Bristol, Queen''s Building, Bristol BS8 1TR, UK;3. Pentair Valves and Controls, 3950 Greenbriar Drive, Stafford, TX 77477, USA;1. Dpto. Matemática Aplicada II & IMUS, Universidad de Sevilla, Escuela Politécnica Superior, Calle Virgen de África, 7, 41011 Sevilla, Spain;2. Dpto. Matemática Aplicada II & IMUS, Universidad de Sevilla, Escuela Técnica Superior de Ingeniería, Camino de los Descubrimientos s/n, 41092 Sevilla, Spain;1. Innomerics, Calle San Juan de la Cruz 2, 28223 Madrid, Spain;2. Iberdrola, Calle Tomás Redondo 1, 28033 Madrid, Spain;3. Alava Ingenieros, Calle Albasanz 16, 28037 Madrid, Spain;1. Department of Engineering, Institute of Computational Engineering, University of Luxembourg, Maison du Nombre6 avenue de la FonteL-4364 ESCH SUR ALZETTE;2. Institute of Research and Development, Duy Tan University, Viet Nam;3. ROTAREX Solutions S.A., 24, rue de Diekirch, L - 7440 Lintgen, Luxembourg;4. Department of Medical Research, China Medical University, China;1. Institute of Process Equipment, Zhejiang University, Hangzhou 310027, PR China;2. Hangzhou Worldwides Valve Co., Ltd., Hangzhou 311122, PR China;3. School of Management, Zhejiang University, Hangzhou 310027, PR China |
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| Abstract: | A previous study of gas-service direct-spring pressure relief valves connected to a tank via a straight pipe is continued by deriving a reduced-order model for predicting oscillatory instabilities such as valve flutter and chatter. The reduction process uses collocation to take into account a finite number N of acoustic pressure waves within the pipe, resulting in a set of 2N+3 ordinary differential equations. Following a novel non-dimensionalization, it is shown analytically that the model can exhibit, at experimentally realistic parameter values, instabilities associated with coupling between the valve and acoustic waves in the pipe. The thresholds for each instability are such that for a given flow rate, the first mode to go unstable as the inlet pipe length increases is the quarter-wave mode, then a three-quarter wave, a 5/4-wave etc. Thus the primary mode of instability should always be due to the quarter wave. In the limit of low flow rates, a simple approximate expression is found for the quarter-wave instability threshold in the form of inlet pipe length against mass flow rate. This threshold curve is found to agree well with simulation of the full model. For higher flow rates there is a need to include fluid convection, inlet pressure loss and pipe friction in order to get good agreement. The reduced model enables the dependence of the stability curve on key dimensionless physical parameters to be readily computed. |
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| Keywords: | Pressure-relief valve Reduced order modelling Instability Quarter-wave Hopf bifurcation Acoustic resonance |
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