Efficiency of energy conversion using shock waves
The flux-corrected transport algorithm has been used to simulate shock-wave flows in linear and spherically converging and diverging tubes in order to determine the energy distributions in the flows and the conversion efficiencies of energy to mechanical work. This was done to evaluate the possibility of using the positive phase of a shock wave, rather than combustion products, as the driving mechanism in an internal-combustion engine, and to suggest the optimum configuration of a supercharging device that uses shock waves to extract energy from the exhaust gases of internal-combustion engines. It is concluded that the positive phase of a shock wave would not be especially useful as the primary driving mechanism of an internal-combustion engine. In the case of the supercharging energy exchangers, the simulations indicate that for charging pressure ratios lower than about 5:1, a linear tube with a compression-chamber length of about 40% would be most efficient, while at higher pressure ratios a converging conical tube with a compression-chamber length of about 10% would be preferred.