The velocity and viscosity impact on the annular spray atomisation of different fuels

Abstract

Numerical methods for predicting the primary breakup length, the ligament and droplet diameter of fuels are a suitable substitute for experimental work. Mazut, diesel, biodiesel and water fluids are selected for the study. A linear instability model has been applied for the analysis of various liquid sprays. The effects of velocity (axial and swirl), viscosity and temperature on the atomisation of fuels annular jets are investigated. The parameters of wave growth value, length of jet breakup, drops and ligaments diameter are obtained by solving the governing equation of the flow spray. The results show that by decreasing the viscosity and increasing the axial and swirl velocity, the rate of disturbance growth increases and causes the faster atomisation of the liquids spray. Also, by increasing the maximum amount of disturbance growth rate and the number of wave that depends on it, the breakup length, diameter of ligament and droplet of fuel are reduced. In general, the atomisation parameters decrease as a power function with increasing wave number. Mazut 40, Mazut 80 and diesel are sprayed experimentally. The breakup lengths obtained from the experimental results are compared with the numerical results. Uncertainty analysis is done for the temperature, mass flow rate and velocity. The experimental results are in good agreement with the numerical results. Finally, the breakup length, drop diameter and ligament diameter are plotted in terms of Reynolds, Ohnesorge, Weber numbers and Temperature. The Ohnesorge number is directly related to Weber number and inversely related to Reynolds number. , and decrease exponentially and , L b, d L and d D decrease linearly with increasing temperature. Experimental and numerical analyses of various and applied fluids in order to gasify and compare the atomisation characteristics among applied fluids give a better understanding of how they behave.