GAS PULSATIONS IN THIN, CURVED OR FLAT CAVITIES DUE TO MULTIPLE MASS-FLOW SOURCES WITH SPECIAL ATTENTION TO MULTI-CYLINDER COMPRESSORS

If compressor manifolds are thin compared to the smallest wavelength o f interest, the general procedure developed by the authors [1,2] for t he analysis of curved, thin muffler elements can be applied to the ana lysis of gas pulsations in multi-cylinder compressor head cavities. Th e procedure for single-input/single-output systems is extended to syst ems of multi-inputs. Four pole parameters and transfer functions for e ach input/output set are obtained separately. The pressure response at the output port excited by each input is calculated by multiplying th e input volume flow rate for each compressor valve with the respective transfer functions. The total pressure response is obtained by superp osition of the pressure response excited by each input. A rectangular box type compressor head cavity with refrigerant discharged from a two -cylinder compressor and a thin cylindrical head cavity of a four-cyli nder automotive air conditioning compressor are analyzed as applicatio n examples. (C) 1996 Academic Press Limited