De Volledige In En Uitvoer Van example essay topic
459 words
4 De numeri eke ui twerking van de vliegproef De berekening van de CL en de CD waarde gebeurt voor het achtste meetpunt. De andere punt en worden uiteraard analoog berekend. C+ 273.15 = 239.91 K AOA = 6.7? Volgens formule (8) bli jkt dat de meetgegevens voldoende zijn voor de berekening van de statische druk.
Substitutie van de getalwaarden levert: p = 101325 = 41035, 47 N / m 2 Nu kan het machgetal bepaald worden, maar daar voor moet eerst de snelheid VIAS omgezet worden naar de gekalibreerde snelheid VCAS. Hiervoor is een omrekeningstabel no dig. (lit. 2 tabel 3.1) Deze tabel be vindt zich achteraan in bijlage I. De snelheid (VCAS) kan nu gebruik worden om het machgetal uit te reken en. Substitutie van de getal waarde in formule (13) levert: M = = 0.295 Eens het mach-getal bekend is, kan de buitenluchttemperatuur eenvoudig uitgerekend worden.
De substitutie van de getalwaarden in de formule (8) levert nu: Nu zijn alle gegevens bekend om de dichtheid r te berekenen. Volgens formule (7) geld t dan: De berekening van het moment ane gewicht is vrij eenvoudig. Het gewicht voor de start was immers bekend, en de verbruikte brands tof is ook bekend (Fuel Used). Het gewicht is dus: W = totaal gewicht? pre-start fuel – fuel used = 63957 N – 133, 5 N? 4205 N = 59619 N Voor dat de waarde van CL kan worden bepaald, moet eerst de ware vliegsnelheid berekend worden.
We kennel immers de relative tussen het machgetal en de ware vliegsnelheid (zie (10) ). Dit gee ft: De CL-waarde kan nu berekend worden. Hiervoor maken we gebruik van formule (4). Dus: De berekening van de CD-waarde loop vrij analoog. De weer stand D is gel ijk aan de trekkracht T. Deze kra cht kan bepaald worden met een computer programma dat is ontwikkeld aan de hand van gegevens van de motorfabrikant. Wanner we per meetpunt achtereenvolgens de drukhoogte, het machgetal, DTtemp, FFL en FFR invoeren berekent het programma de stuwkracht van de linker- en rechtermotor per meetpunt.
De volledige in- en uitvoer van het programma is opgenomen in bijlage II. DTtemp wordt als volt berekend: Na het invoeren van deze gegevens berekent het programma de volgende stuwkracht en: TL = 1657 N TR = 1845 N De totale stuwkracht is dan: T = 1657 + 1845 = 3502 N Aan de hand van formule (6) kunnen we dan Cd berekenen. Tens lotte nog even het bere ik van het Reynoldsgetal bep alen, met gebruik van de gemiddelde a? rodynamische ko orde. Formule (14) en (15) given: elements of airplane performance.
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