DEVELOPMENT OF A COMPRESSION APPARATUS AND STUDIES ON HEAT TRANSFER AND COMBUSTION OF RAPIDLY COMPRESSED AND OSCILLATING GASES.

Abstract

After a review dealing with the experimental apparatus so far developed for investigating self-ignition and knocking properties of explosive gas mixtures by adiabatic  compression, the development of a new Compression apparatus is described. The dynamics of the apparatus,possibilities for their calculation and the state of the compressed mediumare studied, and it is shown that in this type of apparatus the gas after compression is oscillating with considerable pressure amplitudes. The heat transfer and the flame velocity of the oscillating gas is examinedexperimentally and is found to be increased considerably if compared to a gas at rest. The flame propagation in rapidly compressed and spark ignited propane air mixtures in a closed vessel is photographically recorded, and the results for oscillating and non-oscillating gases are compared. The findings of the investigation with the new compression apparatus are that in oscillating gases the transfer of heat to the walls of the container is greatly intensified, and furthermore, that the flame velocity is  considerably increased The report is subdivided into two parts, the first outlining the development of the compression apparatus and the studies of heat transfer in oscillating gases as also the references. The second part comprises the study of combustion of oscillating gases after rapid compression as also the experimental set-up, and conclusions.