PERFORMANCE EVALUATION OF FLAT WALLED DIFFUSER/NOZZLE MICROPUMP FOR FUEL DELIVERY IN SMALL GASOLINE ENGINE

Abstract

An investigation on flat-walled diffuser/nozzle micropump actuated by piezo-ceramic disc is presented towards the fuel delivery in a commercial 4 stroke, 125cc motorcycle. The flow directing ability of the valveless micropump primarily depends on the efficiency of the nozzle/diffuser elements. The diffuser efficiency is calculated from the total pressure loss coefficients. Numerical simulations are attempted to predict the flow characteristics of the diffuser/nozzle micropump using the microproduct design software INTELLISUITE. A breadboard circuit amplifier is developed to supply the high voltage electrical signal to the piezo-ceramic actuator. The numerically calculated flow characteristic of the proposed model is compared with the simulation results and experimental results.