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VLMpc Manual - the AOE home page

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eport typos and errors to W.H. Mason Appendix D: Programs D-475. DELTA CP AT DESIRED CL - ∆C p or Net C p normal to <strong>the</strong> surface at dihedral foreach elemental panel when <strong>the</strong> total lift is C L , d. This is located across <strong>the</strong> panel as anaverage. It corresponds to <strong>the</strong> incremental lift associated with <strong>the</strong> bound vortex strengthof <strong>the</strong> particular panel:The fourth group of data presents <strong>the</strong> following geometric results:1. REF.CHORD - Reference chord of <strong>the</strong> configuration.2. C AVERAGE - Average chord, cav, true configuration area divided by true span.3. TRUE AREA - True area computed from <strong>the</strong> configuration listed in second group ofgeometry data.4. REFERENCE AREA - User input reference area.5. B/2 - Maximum semispan of all planforms listed in second group of geometry data.6. REF. AR - Reference aspect ratio computed from <strong>the</strong> reference planform area and truespan.7. TRUE AR - True aspect ratio computed from <strong>the</strong> true planform area and true span.8. MACH NUMBER - Mach number.AERODYNAMIC DATA∆C p × ∆c = ∆L i , where ∆L i = ρU ∞ Γ iIf PTEST = 1. or QTEST = 1. on <strong>the</strong> configuration card, <strong>the</strong>n ei<strong>the</strong>r C lp or C L q and C mq arecomputed and printed, followed by program termination. O<strong>the</strong>rwise, <strong>the</strong> aerodynamic data aredescribed by at least two groups of results. The first is always present, but <strong>the</strong> second dependson what is requested on <strong>the</strong> configuration card. The following items of <strong>the</strong> first group of data aregiven in <strong>the</strong> order that <strong>the</strong>y are found on <strong>the</strong> printout. Note that CL ALPHA, CL(TWIST),CM/CL, CMO, CDI/CL**2 are based on <strong>the</strong> specified reference dimensions. Many of <strong>the</strong> itemsthat follow are for <strong>the</strong> complete configuration.1. DESIRED CL - Desired lift coefficient, CL, d, specified in Input Data forcomplete configuration.2. COMPUTED ALPHA - Angle of attack at which <strong>the</strong> desired lift is developed:CL, d/(CL ALPHA) + ALPHA at CL=O.3. CL(WB) - That portion of desired lift coefficient developed by <strong>the</strong> planform with<strong>the</strong> maximum span when multiple planforms are specified. When one planform isspecified, this is <strong>the</strong> desired lift coefficient. (If two planforms have <strong>the</strong> samespan, and this value is equal to <strong>the</strong> maximum, <strong>the</strong> planform used here is <strong>the</strong> latterone read in).4. CDI AT CL(WB) - Induced drag coefficient for lift coefficient in <strong>the</strong> previousitem. When two or more planforms are specified, this is <strong>the</strong> induced dragcoefficient of only <strong>the</strong> planform with <strong>the</strong> maximum span. This result is based on<strong>the</strong> far-field solution.5. CDI/(CL(WB)**2) - Induced drag parameter computed from <strong>the</strong> two previousitems.Friday, November 17, 1995

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