As the mixing duct length increases, the mixing process between primary flow and secondary flow is improved toward complete mixing, raising the critical value of mixing ductarea ratio corresponding to the peak flow ratio. The results show that there is an optimum area ratio of mixing duct corresponding to the peak entrainment for a given mixing duct length.

By experimental validation, the semi-empirical model established in the present work is reliable for predicting the lobed mixer–ejector performance.

To capture two key empirical parameters for charactering the operating point of the lobed mixer–ejector in this analytical model, the nonuniformity of the momentum profile at the mixing duct exit and the inlet loss coefficient of secondary flow, a series of three-dimensional numerical computations are carried out. This model is deduced on the conservation relations of mass, momentum, and energy by using the control volume method with consideration of the incomplete mixing in a short mixing duct and the pressure loss of the intake system.

More tracks like Ejector Design Calculation.A semi-empirical one-dimensional model is developed for the incompressible lobed mixer–ejector design and optimization analysis.

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Every constructor, no matter whether designer or production engineer, must constantly bear in mind such knowledge in order to eliminate mistakes which frequently recur in respect of design and production technique. Even if both parties, relying upon their knowledge of materials, of methods of working, and of the general resources in design (such as types of drawing, standardization, etc.) strive to attain the end in view, they have to take into account numerous empirical values which have resulted from practice as useful hints for increasing the quality, and reducing the cost, of production. IT is not an easy task for either designer or production engineer to find at once the best possible and the most economic method of manufacturing a part, taking into consideration that there are so many various cases which may arise in any problem of construction.

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