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Contrail calculator. Based on an approximation to the "Appleman Chart"

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Signed-off-by: Vivian Meazza <vivian.meazza@lineone.net>
This commit is contained in:
Vivian Meazza 2010-08-05 09:07:51 +01:00
parent a2dd320f75
commit 2742085d69
1 changed files with 39 additions and 0 deletions
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Nasal/contrail.nas Normal file
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#########
# contrail calculator. Based on an approxmation to the "Appleman Chart"
# y = -0.077x2 + 2.7188x - 64.36
#
########
updateContrail = func{
var pressure_Node = props.globals.getNode("environment/pressure-inhg");
var temperature_Node = props.globals.getNode("environment/temperature-degc");
var contrail_Node = props.globals.getNode("environment/contrail");
var contrail_temp_Node = props.globals.getNode("environment/contrail-temperature-degc");
var x = pressure_Node.getValue();
var y = temperature_Node.getValue();
var con_temp = -0.077 * x * x + 2.7188 * x - 64.36;
contrail_temp_Node.setValue(con_temp);
if (y < con_temp and y < -40){
contrail_Node.setValue(1);
} else {
contrail_Node.setValue(0);
}
settimer(updateContrail,30)
}
### Contrail
print ("init contrail");
_setlistener("/sim/signals/nasal-dir-initialized", func {
props.globals.initNode("environment/pressure-inhg", 1, "DOUBLE");
props.globals.initNode("environment/temperature-degc", 1, "DOUBLE");
props.globals.initNode("environment/contrail", 1, "BOOL");
props.globals.initNode("environment/contrail-temperature-degc", 1, "DOUBLE");
var static_contrail_node = props.globals.getNode("sim/ai/aircraft/contrail", 1);
var time_node = props.globals.getNode("sim/time/elapsed-sec", 1);
updateContrail();
});