1、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NACA RM A53B06 NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS RESEARCH NEMORANDUM AN IIWESTIGATION OF A FOUR-ELADE SINGLF-ROTATION PROPELLER IN COMBINATION WITH AN NACA 1-SFXIES D-TYPE COWLING AT MACH NCTM
2、BERS UP TO 0.83 By Robert M. Reynolds, Robert I. Sammonds, and George C. Kenyon SUMMARY An investigation has been made of a four-blade single-rotation propeller in combination with an NACA 1-series D-type spinner-cowling combination at Mach numbers up to 0.83. ler operating in the presence of the co
3、wling are compared with the . characteristics of the propeller with the spinner. Pressure distribu- I tions on the surfaces of the cowling with the propeller operating are compared with the pressure distributions on the cowling with the pro- peller removed. The data were obtained at a Reynolds numbe
4、r of 1.3 mil- lion per foot based on the wind-tunnel datum velocity. Characteristics of the propel- Variation of cowling inlet-velocity ratio and change in type of propeller-spinner juncture (ideal and platform) had no significant effects on the characteristics of the propeller operating in the pres
5、- ence of the cowling. The maximum apparent efficiency of the propeller with the spinner-cowling combination was higher, at all Mach numbers, than the efficiency of the propeller with the spinner. With the propeller removed, the static-pressure distributions on For the the surfaces of the cowling we
6、re affected by compressibility and inlet- velocity ratio in a manner typical for the 1-series profile. design inlet-velocity ratio, the measured critical Mach number 0.79 was somewhat higher than the predicted critical Mach number. Operation of the propeller resulted in more positive pressure coeffi
7、cients on the external surface of the cowling, as compared with the distributions obtained with the propeller removed, at all inlet- velocity ratios and Mach numbers. unaffected, at least for the inlet-velocity ratios of these tests, by the change from ideal to platform propeller-spinner junctures.
8、The pressure distributions were Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2 INTRODUCTION NACA RM A73B06 Current interest in the turbine-propeller type of power plant for moderately high-speed long-range airplanes has led to a need for data conc
9、erning the high-speed characteristics of propeller-spinner-cowling combinations suitable for use with large turbine engines. To provide data useful for design purposes, an investigation was undertaken in the Bmes 12-foot pressure wind tunnel to determine the characteristics of a representative prope
10、ller-spinner-cowling combination, employing the NACA 4-(5) (05) -041 four-blade single-rotation propeller with the NACA 1-46.5-047 1-series spinner and the NACA 1-62.8-070 cowling. phase of the investigation, the determination of the characteristics of the propeller-spinner combination in the absenc
11、e of the cowling, has been reported in reference 1. A second phase of the investigation, the effects of propeller operation and propeller-spinner juncture on the pressure-recovery characteristics of the propeller-spinner-cowling cornbination, has been reported in reference 2. One Presented herein ar
12、e the force-test results for the propeller operating in the presence of the spinner-cowling combination, obtained concurrently with the data presented in reference 2. made of the results obtained with the propeller operating in the pres- ence of the cowling with the results presented in reference 1.
13、 static pressures measured on the surfaces of the cowling, with the propeller removed and with the propeller operating, are included. A comparison is The The tests were made with the propeller-spinner-cowling combination at an angle of attack of Oo for propeller blade angles from 40 to 60, for inlet
14、-velocity ratios from 0.26 to 1.33, and at Mach numbers from 0.20 to 0.83. The Reynolds number was constant at 1.5 million per foot throughout the tests. SYMBOLS a speed of sound, ft/sec b blade width, ft czd blade section design lift coefficient apparent propeller power coefficient, - pa P n3D5 Pa
15、Ta apparent propeller thrust coefficient, - Ta P n2D4 C Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NACA RM A33B06 3 D b, D h h b J Mer j3, 50. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-18 N
16、ACA RM A53B06 Figure 6.- The spinner-cowling combination mounted on a 14-inch-diameter, 2-foot-long extension of the dynamometer e Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NACA RM A53B06 Q Provided by IHSNot for ResaleNo reproduction or networ
17、king permitted without license from IHS-,-,-20 NACA RM A53B06 h u *e % 9“ z .$ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-21 NACA RM A53B06 3 0 I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2
18、2 NACA RM A53B06 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NACA RM A53B06 23 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-24 Provided by IHSNot for ResaleNo reproduction or networking permitt
19、ed without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-26 NACA RM A53B06 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4 I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-28 NACA RM A53B06 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-29 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
