Embedded Files
Picture of the newly crafted pitot tube
Picture of the pitot tube connecting to the MPX pressure sensor.
Picture of the diaphragm inside of the pitot tube
The pitot tube’s sensor allows for static pressure to be subtracted from the total pressure mechanically by allowing the vacuum port on the MPX sensor to be connected to the static port on the pitot, therefore, canceling out the static pressure from the total pressure port.
Pitot Tube Inputs Outputs
Pitot Tube Inputs Outputs
The inputs to the Pitot Tube are listed here:
Pitot Tube: Total Pressure
Red Wire: 5 Volts
Black Wire: GND
The outputs of the Pitot Tube are:
Yellow Wire: Dynamic pressure signal
The link to the pitot tube MPX5500 pressure sensor can be found here:
https://www.amazon.com/dp/B005T5L8CK?psc=1&ref=ppx_yo2_dt_b_product_details
The link to the pitot tube can be found here:
The Pitot tube is covered to prevent damage from high temperatures. The analog output is the only value that is accurate from this newly created device yet. It needs a process where it can be calibrated so that the analog values can be mapped to the correct corresponding dynamic pressure.
C++ Code to read the Pitot Tube
C++ Code to read the Pitot Tube
// Pitot Tube
const int v_0 = 0.21; // analog reading of the pitot tube at 0 mph (Volts)
const int V_0 = 42; // analog reading of the pitot tube at 0 mph (analog data)
const int v_70 = 0.4331; // analog reading of the pitot tube at 70 mph (Volts)
const int V_70 = 88.6706; // analog reading of the pitot tube at 70 mph (analog data)
const int Velocity_calibrated_at_70_mph = 70; // Latest calibration at 70 mph from driving in a car (mph)
const int rho = 1.225; // density of air (kg/m^3)
float Pitot_dynamic = 0; // 2nd Current Dynnamic Pressure Value Varibale for the pitot tube
float V = 0; // Current Pressure Value Varibale for Exit Velocity
float Pitot = 0; // Current Dynnamic Pressure Value Varibale for the pitot tube
void loop(void){
float Pitot = analogRead(A3);
Serial.print("Pitot Tube: ");
Serial.print(voltage_Pitot);
Serial.print(", ");
Serial.print(Pitot);
Serial.print(", ");
Serial.print(Pitot_dynamic);
Serial.print(", ");
Serial.print(V);
Serial.println(", ");
}
Configurations & considerations
Configurations & considerations
Pitot Tube Mount Configuration:
Pitot Tube Mount Configuration:
The Pitot tube can be slid back and forth as needed at the back of the pulse jet.
Pitot Tube Design Considerations:
Pitot Tube Design Considerations:
The Pitot tube should ideally be placed right in the middle of the flow field at the exit of the pulse jet.
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