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. $\nu$, ${\overline{\omega }}_M$ and ${\overline{k}}_{Mu}$ decrease exponentially and $\rho$, 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.

预测燃料一次破碎长度，韧带和液滴直径的数值方法可以替代实验工作。研究选择了玛祖特，柴油，生物柴油和水。线性不稳定性模型已应用于各种液体喷雾的分析。研究了速度（轴向和涡旋），粘度和温度对燃料环形射流雾化的影响。通过求解射流的控制方程，可以得到波浪增长值，射流破裂长度，液滴和韧带直径的参数。结果表明，通过降低粘度并增加轴向和涡旋速度，扰动增长的速率增加，并导致液体喷雾的更快雾化。也，通过增加最大扰动增长率和取决于它的波数，可以减小破碎长度，韧带直径和燃料液滴。通常，雾化参数作为功率函数随着波数的增加而减小。

实验喷涂了Mazut 40，Mazut 80和柴油。将实验结果得到的断裂长度与数值结果进行比较。对温度，质量流量和速度进行了不确定性分析。实验结果与数值结果吻合良好。最后，以雷诺，奥尼斯堡，韦伯数和温度绘制破裂长度，液滴直径和韧带直径。Ohnesorge数与Weber数直接相关，与Reynolds数反相关。$\nu$， ${\overline{\omega }}_{\mathrm{中号}}$ 和 ${\overline{ķ}}_{\mathrm{中号}ü}$ 呈指数下降，并且 $\rho$，L _b，d _L和d _D随温度升高线性减小。对各种流体和应用流体进行实验和数值分析，以便气化并比较应用流体之间的雾化特性，从而更好地了解它们的行为。