G0700306 Measurement of sound speed in liquid DME

Abstract

Dimethyl ether is an alternative fuel for diesel cycle engines. In order to understand the spray behavior of DME, it is necessary to know the sound speed, however there is not the reliable value. In this study, we measured the speed of sound in DME in a wide pressure and temperature range of 1-80 MPa, 298-413 K. Sound speed in DME is about 400 m/s slower than that in diesel fuel. Near the critical point, the sound speed decreases remarkably. The measured values are consistent with speed of sound calculated based on BWR equation of state.