ESDU 74028

One-dimensional compressible gas flow in ducts.

Abstract:

ESDU 74028 gives curves and equations for use in the calculation of isentropic flow of a perfect gas; they are applicable to numerous practical situations. The curves are plotted for a range of ratios of specific heat capacities from 1 to 1.67 and for Mach numbers to unity. The equations can be applied to all Mach numbers provided no dissociation occurs. The conditions covered are 1. at a point in the flow, the ratio of static/total temperature, of static/total pressure, and of velocity/speed of sound in the gas brought isentropically to rest; 2. at a point in the flow, the ratios of kinetic/total pressure and of dynamic/kinetic pressure; 3. for the expansion of a gas through a nozzle with sonic flow at the throat, the ratio as a function of Mach number of the pressure, temperature and area at any point in the flow to the pressure, temperature and area respectively at the throat; 4. in the expansion from a reservoir, the ratio of density, temperature and velocity to the corresponding reservoir conditions as a function of pressure ratio and 5. three mass flow functions involving total pressure and temperature, total temperature but static pressure, and static pressure and temperature.

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Details:

Data Item ESDU 74028
Format:	PDF with interactive graphs
Status:	Amendment (D), 01 Mar 2007 Published in Release 2007-02
Previous Releases:	ESDU 74028 Amendment C
ISBN:	978 0 85679 082 9

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This Data Item contains 23 interactive graph(s) as listed below.

Graph	Title
Figure 1	Ratio of static to total temperature
Figure 2	Ratio of static to total pressure
Figure 3	Ratio of local velocity to local 'total' speed of sound
Figure 4	Ratio of kinetic pressure to total pressure
Figure 5 - Part 1	Ratio of dynamic pressure to kinetic pressure
Figure 5 - Part 2	Ratio of dynamic pressure to kinetic pressure
Figure 6 - Part 1	Ratio of local pressure to pressure where M = 1
Figure 6 - Part 2	Ratio of local pressure to pressure where M = 1
Figure 6 - Part 3	Ratio of local pressure to pressure where M = 1
Figure 7 - Part 1	Ratio of local temperature to temperature where M = 1
Figure 7 - Part 2	Ratio of local temperature to temperature where M = 1
Figure 8a - Part 1	Ratio of local area to area where M = 1 (0.05 ≤ M ≤ 0.7)
Figure 8a - Part 2	Ratio of local area to area where M = 1 (0.05 ≤ M ≤ 0.7)
Figure 8b - Part 1	Ratio of local area to area where M = 1 (0.6 ≤ M ≤ 2.0)
Figure 8b - Part 2	Ratio of local area to area where M = 1 (0.6 ≤ M ≤ 2.0)
Figure 8b - Part 3	Ratio of local area to area where M = 1 (0.6 ≤ M ≤ 2.0)
Figure 9	Isentropic expansion of air from rest
Figure 10 - Part 1	Mass flow function
Figure 10 - Part 2	Mass flow function
Figure 11 - Part 1	Mass flow function
Figure 11 - Part 2	Mass flow function
Figure 12 - Part 1	Mass flow function
Figure 12 - Part 2	Mass flow function