Numerical prediction of a turbulent evaporating fuel spray in a recirculating flow

Abstract

the adiabatic efficiency which is considered to closely approximate the true performance because the delivery pressure in the LN2 tests was less than 16 MPa. With regard to LH2, not only the adiabatic efficiency, but also the polytropic efficiency, is presented in Fig. 4. The polytropic efficiency fairly well agreed with the head and efficiency obtained in the LN2 test. Based on the above mentioned fact, the polytropic efficiency can be considered to show nearly true pump head and efficiency. The efficiency of about 80% at the designed flow ratio (Ql Qd 1.0) with the LOX pump mentioned above is considered to be fairly high compared with those of the previously developed rocket pumps as shown in Fig. 5. Figure 5 shows the stage efficiency of the rocket pumps with the main impeller, the diameter of which was more than 195 mm. The efficiency of about 75% obtained with the present LH2 pump can also be considered as reasonable as shown in Fig. 5.