14.50(a)) to relatively large round leading edge radii, see Fig. Simulated investigations have shown a marked decrease in the drag coefficient from having sharp forebody edges (see Fig. Read moreĪ reduction in the drag coefficient of large vehicles such as buses, coaches and trucks can be made by rounding the front leading edges of the vehicle. Increasing the values of both of these parameters led to a reduction of both the measured and predicted static pressure variations at the rotor inlet.Īn interesting finding for designers was that increasing the size of the vaneless space was a more aerodynamically efficient method of obtaining a more circumferentially uniform flow around the rotor periphery. It was found that the aerodynamic optimum values for these two parameters were 1.175 and 1.25, respectively.
#AIRFOIL MEANING SERIES#
Performance tests were carried out on two series of vaned stator designs in order to measure the efficiency variations with varying values of the parameters R te / R le and solidity c/s. The authors used computational fluid dynamics and reported that it was a reliable tool in predicting trends of both stage efficiency and mass flow. The purpose of these tests was to determine the effects that the parameter R te / R le 2 and the vane solidity had on the stage efficiency. Hall Ph.D., in Fluid Mechanics and Thermodynamics of Turbomachinery (Seventh Edition), 2014 Effects of varying the vaneless space and the vane solidityĪn extensive experimental program of tests have been reported by Simpson, Spence, and Watterson (2013) carried out on a 135-mm-tip diameter radial turbine with a variety of stator vane designs. Properties of Selected NACA Airfoils 267 8.2.10 NACA Airfoils in Summary – Pros and Cons and Comparison of Characteristics 267 8.2.9 Step 8: Calculate the Upper and Lower Ordinates 263 8.2.4
Step 7: Calculate the Ordinate Rotation Angle 263 Step 6: Calculate the Slope of the Mean-line 263 Step 5: Compute the y-value for the Mean-line 262 Generation of the NACA 4415 – an Example Implementation 260 8.2.3 Step 8: Calculate the Upper and Lower Ordinates 260 Step 7: Calculate the Ordinate Rotation Angle 260 Step 6: Calculate the Slope of the Mean-line 259 Step 5: Compute the y-value for the Mean-line 259
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