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adjacenttoanddownstreaomfthestatictap,abluestreak where i refers to the ith spanwise measurement location from markingtheflowdirectionresultedT.heOzalidpaperwas the hub;j refers to the station number (1 is upstream of the ro- tapedparalletloquasi-orthogonlinaelsscribedontheblade tor,2isdownstream); AAistheincremental flowarea;Vnisthe surfaceKs.nowingtheorientatioonfthescribelinesw,ecould velocity component normal toA4(V,_=Vzupstream ofthero- determintheepitchorientationftheresultanatmmontiaraces. tor and Vn = Vr downstream of the rotor); P,, and To are the ple- num total pressure and temperature, respectively; and NS is the number of survey locations across the span. Typically, mea- surements were acquired at 20 or more survey locations across the span, and the endwall boundary layers were resolved to within 1 percent of the span. The tare torque I"tare that was used to calculate the torque- based efficiency fir was determined from torque measurements with a bare aluminum rotor (smooth rotor hub contour without blades) operating at 1862 rpm without a shroud. The tare torque represents the torque required to overcome all drag forces not associated with the aerodynamic blade pressure loading (e.g., bearing friction, rotor drum windage, etc.). The tare torque was subtracted from the measured torque in order to determine the actual torque required to drive the compressor against the aerodynamic blade pressure loading. After aerodynamic testing was completed, we discovered that the downstream total temperature sensor was broken and thus provided a false total temperature. The total temperature was, therefore, determined iteratively by using the Euler energy equation and assuming adiabatic flow conditions: Calculation Procedures All of the data presented herein were corrected to NACA standard-day sea-level conditions (tst d = 288.2 K; Pstd = 101 325 N/m 2) at the plenum. Performance Measurements Rotor overall performance was based on plenum total pres- sure, bellmouth mass flow, torque, and the five-hole probe measurements acquired at station 2, downstream of the rotor. The bellmouth mass flow was corrected to standard-day condi- tions at the plenum. The spanwise distributions of total tem- perature were mass-averaged across the span. The spanwise distributions of total pressure were energy-averaged by converting them to their enthaipy equivalents and then mass- averaging them across the span. The formulas used were NSj rijpj, T.i = i=-_sj ZPj,i(Vn)j,i(AA)j,i i=l ZPj,i(Vn)j,i(AA)j,i T2,i = To _ad = G'-b ] T2 1 To •] m" o[t J -' "qr = =(r- r=.)(r-,) i=1 (1) )sin(162,i ) (2) VO 2,i Cp -/ /']2,i Voz,.. = V2,i c°s(aT,i U2,i T2,i =To +_ (y-l) r/2"i= T2'i 1 r,,PDF Image | Laser anemometer measurements of the three-dimensional rotor flow
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