Xls Better - Ejector Design Calculation

AmixAtthe fraction with numerator cap A sub m i x end-sub and denominator cap A sub t end-fraction Section 3: Iteration Section (Using Solver) Target: Minimize the error between the calculated Pdcap P sub d and the target Pdcap P sub d Variable: Mixing Throat Area ( Amixcap A sub m i x end-sub Section 4: Final Dimensions and Results Nozzle Throat Diameter ( Mixing Throat Diameter ( Diffuser Exit Diameter ( Entrainment Ratio (w). 4. Modeling Performance with Empirical Correlations

): Calculate the cross-sectional area needed to support the motive mass flow rate at sonic speed. Size the Mixer Throat (

Suction inlet conditions and suction velocity

An is a practical, lightweight tool for engineers to quickly size ejectors for gases, vapors, or liquids. While not a replacement for rigorous simulation, it provides reliable first estimates, facilitates design reviews, and serves as an excellent teaching aid. For final detailed engineering, manufacturer validation and CFD are still recommended. ejector design calculation xls

Ejector Design Calculation xls: A Comprehensive Guide to Spreadsheet Modeling

A₁ and A₃ are adjusted to ensure the pressure profile remains optimized throughout the ejector length.

= Isentropic expansion coefficient (approx. 1.3 for superheated steam) = Molecular weight ( = Universal gas constant ( Tmcap T sub m = Motive steam temperature ( Diffuser Pressure Recovery AmixAtthe fraction with numerator cap A sub m

Before diving into spreadsheet formulas, we must establish the core physics.

: Modeling the supersonic shock and diffuser compression.

) and determining the (diameters and areas) of the nozzle and mixing sections. These calculations often rely on empirical correlations, such as those derived by Hisham El-Dessouky, which provide high precision (up to ) for steam jet systems. Core Calculation Steps for an XLS Spreadsheet Size the Mixer Throat ( Suction inlet conditions

Mixing in the mixing chamber (momentum and energy balance)

: Encourage users to download or provide feedback. For instance, "Download this Ejector Design Spreadsheet to generate performance curves and verify your own ejector dimensions". Lempor Ejector Calculator Beta 1.1 | PDF | Steam Locomotive