ESDU 86030
Ejectors and jet pumps. Design for steam driven flow.
Abstract:
ESDU 86030 gives stepbystep calculation procedures, based on performance charts, for the optimum design of steam/liquid and steam/gas ejectors. For steam/gas ejectors the data are derived from a wide range of experimental results, but for steam/liquid ejectors there were insufficient data and a theoretical analysis was used. For steam/liquid ejectors a performance prediction method is included that allows offdesign behaviour to be estimated. Practical examples using the methods illustrate their application. Mechanical design considerations for the components (primary nozzle, mixing chamber, contraction or diffuser) are described, and the use of annular or multinozzle arrangements is considered. Application by multistaging is discussed. Operating problems in startup or shutdown are introduced, together with consideration of instability and noise. Limits imposed by the onset of cavitation and vapour binding are outlined for steam/liquid use. ESDU 94046 introduces a program, ESDUpac A9446, that implements the method outlined here.Indexed under:
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Data Item ESDU 86030  

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This Data Item contains 34 interactive graph(s) as listed below.
Graph  Title 

Figure 1  Steam/liquid ejectors: optimum area ratio A_{R} v pressure ratio N_{1} (0.001 < r_{c} < 0.010) 
Figure 2  Steam/liquid ejectors: optimum area ratio A_{T} v pressure ratio N_{1} (0.001 < r_{c} < 0.010) 
Figure 3a  Steam/liquid ejectors: optimum mass flow ratio r_{m} v pressure ratio N_{1} (0 < N_{1} < 0.3) 
Figure 3b  Steam/liquid ejectors: optimum mass flow ratio r_{m} v pressure ratio N_{1} (N_{1} > 0.3) 
Figure 4  Steam/gas ejectors: correction factor C_{1} v gas molecular weight 
Figure 5  Steam/gas ejectors: correction factor C_{2} v gas inlet temperature 
Figure 6a  Steam/gas ejectors: effect of mass flow ratio r_{m} on variation of secondary pressure ratio N_{s} with primary pressure ratio N_{p}  best values 
Figure 6b  Steam/gas ejectors: effect of mass flow ratio r_{m} on variation of secondary pressure ratio N_{s} with primary pressure ratio N_{p}  typical values 
Figure 7  Steam/gas ejectors: effect of mass flow ratio r_{m} on variation of area ratio A_{T} with primary pressure ratio N_{p} 
Figure 8  Steam/gas ejectors: optimum values of area ratio A_{r}^{*} as a function of mass flow ratio r_{m} and pressure ratio N_{p} 
Figure 9a  Steam/liquid ejectors: performance prediction curves 
Figure 9b  Steam/liquid ejectors: performance prediction curves 
Figure 9c  Steam/liquid ejectors: performance prediction curves 
Figure 9d  Steam/liquid ejectors: performance prediction curves 
Figure 9e  Steam/liquid ejectors: performance prediction curves 
Figure 9f  Steam/liquid ejectors: performance prediction curves 
Figure 9g  Steam/liquid ejectors: performance prediction curves 
Figure 9h  Steam/liquid ejectors: performance prediction curves 
Figure 9i  Steam/liquid ejectors: performance prediction curves 
Figure 9j  Steam/liquid ejectors: performance prediction curves 
Figure 9k  Steam/liquid ejectors: performance prediction curves 
Figure 9l  Steam/liquid ejectors: performance prediction curves 
Figure 9m  Steam/liquid ejectors: performance prediction curves 
Figure 9n  Steam/liquid ejectors: performance prediction curves 
Figure 9o  Steam/liquid ejectors: performance prediction curves 
Figure 9p  Steam/liquid ejectors: performance prediction curves 
Figure 9q  Steam/liquid ejectors: performance prediction curves 
Figure 9r  Steam/liquid ejectors: performance prediction curves 
Figure 9s  Steam/liquid ejectors: performance prediction curves 
Figure 9t  Steam/liquid ejectors: performance prediction curves 
Figure 9u  Steam/liquid ejectors: performance prediction curves 
Figure 9v  Steam/liquid ejectors: performance prediction curves 
Figure 9w  Steam/liquid ejectors: performance prediction curves 
Figure 9x  Steam/liquid ejectors: performance prediction curves 