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Atmosphere Calculator
JavaScript can help you do atmospheric computations.
Select unit system:
English
Metric
Inputs
Altitude
Speed
Reference Length
Results
Temperature
Density
Pressure
Speed of Sound
Viscosity
Mach Number
Dynamic Pressure
Critical Cp
Vacuum Cp
Reynolds Number
Laminar Cf
Turbulent Cf
Insert into <HEAD>
<SCRIPT LANGUAGE="JavaScript"> <!-- Original: Ilan Kroo kroo@leland.stanford.edu <!-- Begin function setEUnits() { var str = document.forms[1].hunits.value; if ( str== "ft") { alert("Already in English Units."); return; } document.forms[1].hunits.value = "ft" document.forms[1].vunits.value = "ft/sec" document.forms[1].lunits.value = "ft" document.forms[2].tunits.value = "deg R" document.forms[2].runits.value = "sl/ft^3" document.forms[2].punits.value = "lb/ft^2" document.forms[2].sunits.value = "ft/sec" document.forms[2].muunits.value = "lb sec/ft^2" document.forms[2].qunits.value = "lb/ft^2" var h = document.forms[1].alt.value; var v =document.forms[1].speed.value; var rl = document.forms[1].rlength.value; var tempVal = document.forms[2].temp.value var rhoVal = document.forms[2].rho.value var pVal = document.forms[2].press.value var soundVal = document.forms[2].ssound.value var viscVal = document.forms[2].visc.value var machVal = document.forms[2].mach.value var qVal =document.forms[2].q.value var cpstarVal = document.forms[2].cpstar.value var cpminVal = document.forms[2].cpmin.value var reynolds = document.forms[2].reno.value var cflam = document.forms[2].cfl.value var cfturb = document.forms[2].cft.value document.forms[1].alt.value = h*3.2808 document.forms[1].speed.value = v*3.2808 document.forms[1].rlength.value = rl*3.2808 document.forms[2].temp.value =tempVal*1.8 document.forms[2].rho.value = rhoVal * .068521 * .028317 document.forms[2].press.value = pVal * .020885 document.forms[2].ssound.value = soundVal*3.2808 document.forms[2].visc.value = viscVal*.22481*.092903 document.forms[2].mach.value = machVal document.forms[2].q.value = qVal * .020885 document.forms[2].cpstar.value = cpstarVal document.forms[2].cpmin.value = cpminVal document.forms[2].reno.value = reynolds document.forms[2].cfl.value = cflam document.forms[2].cft.value = cfturb roundAll(); } function setMUnits() { var str = document.forms[1].hunits.value; if ( str== "m") { alert("Already in metric units."); return; } Compute(); document.forms[1].hunits.value = "m" document.forms[1].vunits.value = "m/sec" document.forms[1].lunits.value = "m" document.forms[2].tunits.value = "deg K" document.forms[2].runits.value = "kg/m^3" document.forms[2].punits.value = "N/m^2" document.forms[2].sunits.value = "m/sec" document.forms[2].muunits.value = "N sec/m^2" document.forms[2].qunits.value = "N/m^2" var h = document.forms[1].alt.value; var v = document.forms[1].speed.value; var rl = document.forms[1].rlength.value; var tempVal = document.forms[2].temp.value var rhoVal = document.forms[2].rho.value var pVal = document.forms[2].press.value var soundVal = document.forms[2].ssound.value var viscVal = document.forms[2].visc.value var machVal = document.forms[2].mach.value var qVal =document.forms[2].q.value var cpstarVal = document.forms[2].cpstar.value var cpminVal = document.forms[2].cpmin.value var reynolds = document.forms[2].reno.value var cflam = document.forms[2].cfl.value var cfturb = document.forms[2].cft.value document.forms[1].alt.value = h/3.2808 document.forms[1].speed.value = v/3.2808 document.forms[1].rlength.value = rl/3.2808 document.forms[2].temp.value =tempVal/1.8 document.forms[2].rho.value = rhoVal / .068521 / .028317 document.forms[2].press.value = pVal / .020885 document.forms[2].ssound.value = soundVal/3.2808 document.forms[2].visc.value = viscVal/.22481/.092903 document.forms[2].mach.value = machVal document.forms[2].q.value = qVal / .020885 document.forms[2].cpstar.value = cpstarVal document.forms[2].cpmin.value = cpminVal document.forms[2].reno.value = reynolds document.forms[2].cfl.value = cflam document.forms[2].cft.value = cfturb roundAll(); } function ResetForm() { document.forms[1].alt.value = "0.0" document.forms[1].speed.value = "1.0" document.forms[1].rlength.value = "1.0" } function Compute() { // First set to English Units var origUnits = "english"; var str = document.forms[1].hunits.value; if ( str== "m") { origUnits = "metric"; setEUnits(); } var h = document.forms[1].alt.value; var v =document.forms[1].speed.value; var rl = document.forms[1].rlength.value; var TEMPSL = 518.67; var RHOSL = 0.00237689; var PRESSSL = 2116.22; var saTheta = 1.0 var saSigma = 1.0 var saDelta = 1.0 if ( h<232940 ){ saTheta = 1.434843 - h/337634; saSigma = Math.pow( 0.79899-h/606330, 11.20114 ); saDelta = Math.pow( 0.838263-h/577922, 12.20114 ); } if ( h<167323 ){ saTheta = 0.939268; saSigma = 0.00116533 * Math.exp( (h-154200)/-25992 ); saDelta = 0.00109456 * Math.exp( (h-154200)/-25992 ); } if ( h<154199 ){ saTheta = 0.482561 + h/337634; saSigma = Math.pow( 0.857003+h/190115, -13.20114 ); saDelta = Math.pow( 0.898309+h/181373, -12.20114 ); } if ( h<104987 ){ saTheta = 0.682457 + h/945374; saSigma = Math.pow( 0.978261+h/659515, -35.16319 ); saDelta = Math.pow( 0.988626+h/652600, -34.16319 ); } if ( h<65617 ){ saTheta = 0.751865; saSigma = 0.297076 * Math.exp( (36089-h)/20806 ); saDelta = 0.223361 * Math.exp( (36089-h)/20806 ); } if ( h<36089 ){ saTheta = 1.0 - h/145442; saSigma = Math.pow( 1.0-h/145442, 4.255876 ); saDelta = Math.pow( 1.0-h/145442, 5.255876 ); } var tempVal = TEMPSL * saTheta; var rhoVal = RHOSL * saSigma; var pVal = PRESSSL * saDelta; var viscVal = 0.0226968*Math.pow( tempVal, 1.5 ) / ((tempVal)+198.72) / 1000000.0; var soundVal = Math.sqrt( 1.4*1716.56*(tempVal) ); var machVal = v/soundVal var qVal = 0.7*pVal*machVal*machVal var reynolds = v*rl*rhoVal/viscVal var cfturb = 0.455/Math.pow((Math.log(reynolds)/Math.log(10)),2.58) var cflam = 1.328/Math.sqrt(reynolds) document.forms[2].temp.value = tempVal document.forms[2].rho.value = rhoVal document.forms[2].press.value = pVal document.forms[2].ssound.value = soundVal document.forms[2].visc.value = viscVal document.forms[2].mach.value = machVal document.forms[2].q.value = qVal document.forms[2].cpstar.value = (Math.pow((1/1.2 + machVal*machVal/6.0),3.5)-1)/(0.7*machVal*machVal) document.forms[2].cpmin.value = -1.0/(0.7*machVal*machVal) document.forms[2].reno.value = reynolds document.forms[2].cfl.value = cflam document.forms[2].cft.value = cfturb if (origUnits == "metric") { setMUnits(); } roundAll(); } // Rounding function roundAll(){ document.forms[1].alt.value = truncNum(document.forms[1].alt.value,9) document.forms[1].speed.value = truncNum(document.forms[1].speed.value,7) document.forms[1].rlength.value = truncNum(document.forms[1].rlength.value,7) document.forms[2].temp.value =truncNum(document.forms[2].temp.value,7) document.forms[2].rho.value = truncNum(document.forms[2].rho.value,7) document.forms[2].press.value = truncNum(document.forms[2].press.value,7) document.forms[2].ssound.value = truncNum(document.forms[2].ssound.value ,8) document.forms[2].visc.value = truncNum(document.forms[2].visc.value,10) document.forms[2].mach.value = truncNum(document.forms[2].mach.value,6) document.forms[2].q.value = truncNum(document.forms[2].q.value,7) document.forms[2].cpstar.value = truncNum(document.forms[2].cpstar.value,6) document.forms[2].cpmin.value = truncNum(document.forms[2].cpmin.value,6) document.forms[2].reno.value = truncNum(document.forms[2].reno.value,9) document.forms[2].cfl.value = truncNum(document.forms[2].cfl.value,7) document.forms[2].cft.value = truncNum(document.forms[2].cft.value,7) return; } function truncNum(inputVal, rsize) { var instr = " " + inputVal var inputlength = instr.length if (inputlength<=rsize+1) return instr.substring(1, inputlength); var epos = strpos(instr, "e") if ( epos > rsize+1) { var instr1 = instr.substring(1,rsize+1) + instr.substring(epos,inputlength); return instr1; } var rounded = instr.substring(1, rsize+1); return rounded; } function strpos(str, ch) { for (var i = 0; i < str.length; i++) if (str.substring(i, i+1) == ch) return i; return -1; } // End --> </SCRIPT>
Insert into <BODY>
<FORM name = "units"> Select unit system: <INPUT TYPE="radio" VALUE="radio" NAME="unitbut" CHECKED="true" onClick="setEUnits()">English <INPUT TYPE="radio" VALUE="radio" NAME="unitbut" onClick="setMUnits()">Metric </FORM> <p> <HR> <H3>Inputs</H3> <FORM name="inputs"> <table> <tr> <td>Altitude</td> <td><INPUT NAME="alt" TYPE=text VALUE="0.0" SIZE=15></td> <td><INPUT NAME="hunits" TYPE=text SIZE=6 VALUE="ft"></td> </tr> <tr> <td>Speed</td> <td><INPUT NAME="speed" TYPE="text" VALUE="1.0" SIZE="15"></td> <td><INPUT NAME="vunits" TYPE="text" SIZE="6" VALUE="ft/sec"></td> </tr> <tr> <td>Reference Length</td> <td><INPUT NAME="rlength" TYPE="text" VALUE="1.0" SIZE="15"></td> <td><INPUT NAME="lunits" TYPE="text" SIZE="6" VALUE="ft"></td> </tr> </table> <BR> <BR> <INPUT NAME="name" TYPE="button" VALUE="Compute" onClick="Compute()"> <INPUT NAME="name" TYPE="button" VALUE="Reset" onClick="ResetForm()"> </FORM> <HR SIZE="4"> <H3>Results</H3> <FORM name = "results"> <table> <tr> <td>Temperature</td> <td><INPUT NAME="temp" TYPE="text" SIZE="15"></td> <td><INPUT NAME="tunits" TYPE="text" SIZE="8" VALUE="ƒR"></td> </tr> <tr> <td>Density</td> <td><INPUT NAME="rho" TYPE="text" SIZE="15"></td> <td><INPUT NAME="runits" TYPE="text" SIZE="8" VALUE="sl/ft^3"></td> </tr> <tr> <td>Pressure</td> <td><INPUT NAME="press" TYPE="text" SIZE="15"></td> <td><INPUT NAME="punits" TYPE="text" SIZE="8" VALUE="lb/ft^2"></td> </tr> <tr><td>Speed of Sound</td> <td><INPUT NAME="ssound" TYPE="text" SIZE="15"></td> <td><INPUT NAME="sunits" TYPE="text" SIZE="8" VALUE="ft/sec"></td> </tr> <tr> <td>Viscosity</td> <td><INPUT NAME="visc" TYPE="text" SIZE="15"></td> <td><INPUT NAME="muunits" TYPE="text" SIZE="11" VALUE="lb sec/ft^2"></td> <tr></tr> </tr> <tr> <td>Mach Number</td> <td><INPUT NAME="mach" TYPE="text" SIZE="15"></td> </tr> <tr> <td>Dynamic Pressure</td> <td><INPUT NAME="q" TYPE="text" SIZE="15"></td> <td><INPUT NAME="qunits" TYPE="text" SIZE="8" VALUE="lb/ft^2"></td> </tr> <tr> <td>Critical Cp</td> <td><INPUT NAME="cpstar" TYPE="text" SIZE="15"></td> </tr> <tr> <td>Vacuum Cp</td> <td><INPUT NAME="cpmin" TYPE="text" SIZE="15"></td> <tr> </tr> </tr> <tr> <td>Reynolds Number</td> <td><INPUT NAME="reno" TYPE="text" SIZE="15"></td> </tr> <tr> <td>Laminar Cf</td> <td><INPUT NAME="cfl" TYPE="text" SIZE="15"></td> </tr> <tr> <td>Turbulent Cf</td> <td><INPUT NAME="cft" TYPE="text" SIZE="15"></td> </tr> </table> </FORM>
Other Options
