ESDU 86030

Ejectors and jet pumps. Design for steam driven flow.

Abstract:

ESDU 86030 gives step-by-step 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 off-design 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 multi-nozzle arrangements is considered. Application by multi-staging is discussed. Operating problems in start-up or shut-down 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:

Ejectors

Details:

Data Item ESDU 86030
Format:	PDF with interactive graphs
Status:	Amendment (A), 01 Mar 2007 Published in Release 2007-02
Previous Releases:	ESDU 86030
ISBN:	978 0 85679 582 4

The graphs listed below are available only to subscribers.

Subscribers login here.
If you are not an ESDU subscriber find out how to subscribe.

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 N₁ (0.001 < r_c < 0.010)
Figure 2	Steam/liquid ejectors: optimum area ratio A_T v pressure ratio N₁ (0.001 < r_c < 0.010)
Figure 3a	Steam/liquid ejectors: optimum mass flow ratio r_m v pressure ratio N₁ (0 < N₁ < 0.3)
Figure 3b	Steam/liquid ejectors: optimum mass flow ratio r_m v pressure ratio N₁ (N₁ > 0.3)
Figure 4	Steam/gas ejectors: correction factor C₁ v gas molecular weight
Figure 5	Steam/gas ejectors: correction factor C₂ 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