ESDU 74028
Onedimensional 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.Indexed under:
 Kinetic Pressure
 Onedimensional Flow
 Stagnation Conditions
 Total Pressure
 Total Pressure Coefficient
 Total Temperature
 Universal Gas Constant
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Data Item ESDU 74028  

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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 
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