git.gag.com Git - sw/motorsim/blob - test/com/billkuker/rocketry/motorsim/test/ConvergentDivergentNozzleTest.java

   1 package com.billkuker.rocketry.motorsim.test;\r
   2 \r
   3 import javax.measure.quantity.Area;\r
   4 import javax.measure.quantity.Force;\r
   5 import javax.measure.quantity.Pressure;\r
   6 import javax.measure.unit.SI;\r
   7 \r
   8 import junit.framework.Assert;\r
   9 \r
  10 import org.jscience.physics.amount.Amount;\r
  11 import org.junit.Test;\r
  12 \r
  13 import com.billkuker.rocketry.motorsim.ConvergentDivergentNozzle;\r
  14 import com.billkuker.rocketry.motorsim.fuel.KNSU;\r
  15 \r
  16 public class ConvergentDivergentNozzleTest extends AbstractRocketTest {\r
  17         \r
  18         ConvergentDivergentNozzle n = new ConvergentDivergentNozzle();\r
  19         \r
  20         {\r
  21                 n.setThroatDiameter(Amount.valueOf(6.6, SI.MILLIMETER));\r
  22                 n.setExitDiameter(Amount.valueOf(20.87, SI.MILLIMETER));\r
  23                 n.setEfficiency(0.85);\r
  24         }\r
  25 \r
  26         @Test\r
  27         public void testThroatArea() {\r
  28                 Amount<Area> a = n.throatArea().to(SI.MILLIMETER.pow(2).asType(Area.class));\r
  29                 assertApproximate(Amount.valueOf(34.2, .1, SI.MILLIMETER.pow(2)), a);\r
  30         }\r
  31 \r
  32         @Test\r
  33         public void testExitArea() {\r
  34                 Amount<Area> a = n.exitArea();\r
  35                 assertApproximate(Amount.valueOf(342, .1, SI.MILLIMETER.pow(2)), a);\r
  36         }\r
  37 \r
  38         @Test\r
  39         public void testThrust() {\r
  40                 Amount<Pressure> Patm = Amount.valueOf(101000, SI.PASCAL);\r
  41                 Amount<Pressure> Po = Amount.valueOf(2046491, SI.PASCAL);\r
  42                 Amount<Pressure> Pe = Patm;\r
  43 \r
  44                 KNSU f = new KNSU();\r
  45                 \r
  46                 Amount<Force> t = n.thrust(Po, Pe, Patm, f.getCombustionProduct().getRatioOfSpecificHeats2Phase());\r
  47                 \r
  48                 Amount<Force> expected = Amount.valueOf(87.2, .1, SI.NEWTON);\r
  49                 \r
  50                 assertApproximate(t, expected);\r
  51         }\r
  52 \r
  53         @Test\r
  54         public void testThrustCoefficient() {\r
  55                 Amount<Pressure> Patm = Amount.valueOf(101000, SI.PASCAL);\r
  56                 Amount<Pressure> Po = Amount.valueOf(2046491, SI.PASCAL);\r
  57                 Amount<Pressure> Pe = Patm;\r
  58 \r
  59                 KNSU f = new KNSU();\r
  60                 \r
  61                 double cF = n.thrustCoefficient(Po, Pe, Patm, f.getCombustionProduct().getRatioOfSpecificHeats2Phase());\r
  62                 \r
  63                 \r
  64                 Assert.assertEquals(cF, 1.2454812344324655);\r
  65         }\r
  66 \r
  67 }\r