Aircraft Material Heat Release Rate Tester

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This OSU heat release rate tester is originally from Marlin Engineering in the United States and is recognized by the FAA. The initial design was completed by Smith of Ohio State University in 1972 and later became an FAA-designated combustion testing instrument.

It complies with FAR Part 25 Appendix F Part IV, Airbus AITM 2.0006, Boeing BSS 7322, and ASTM E906. The instrument is used for evaluating the heat release characteristics of aircraft materials.

The main components of the OSU heat release rate tester include an insulated outer enclosure, electric radiant heating device, ignition device, and constant-temperature constant-flow unit.

During testing, air passes through the enclosure at a constant flow rate. The data acquisition system records inlet and outlet air temperatures and wall temperature, and calculates the heat release rate based on the energy per unit exposed surface.

The OSU heat release rate tester can also be equipped with an FTIR gas toxicity testing system to measure toxic gases such as CO, CO2, NOx, HCN, HBr, and HCl.

The FAA-recognized OSU heat release rate tester uses three specimens, each with an exposed area of 15 cm x 15 cm and the actual use thickness. Specimens are placed vertically. The ignition source is a radiant device with a medium flame located at the bottom of the specimen. The heat flux is 35 kW/m2 and the ignition source is applied for 5 minutes.

Qualified materials shall have a peak heat release rate within the first 5 minutes not greater than 65 kW/m2, and a total heat release within the first 2 minutes not greater than 65 W min/cm2.

The OSU heat release rate tester produced by Marlin Engineering can be operated at different incident heat fluxes such as 20 kW/m2 and 50 kW/m2, and can measure PHRR and THR15.

• FAR Part 25 Appendix F Part IV
• ASTM E906
• Airbus AITM 2.0006
• Boeing BSS 7322

Structural Features

• Stainless steel combustion test chamber with high-temperature resistant glass observation window.
• Radiant heat source consists of four Glowbars heating rods and can provide a maximum radiant heat flux of 100 kW/m2.
• Heating rods are 508 mm long, 16 mm outer diameter, with nominal resistance value of 1.4 ohms.
• Air distribution system made of 6.3 mm thick aluminum plate.
• Flue duct made of stainless steel with cross section 133 mm x 70 mm and length 254 mm.
• Upper and lower ignition burners made of stainless steel; outer diameter 6.3 mm and wall thickness 0.8 mm. Upper ignition burner length 360 mm and lower ignition burner length 400 mm.
• Ignition gas flow rates: methane 120 cm3/min and air 850 cm3/min.
• Imported gas and air flow meters with 2 percent accuracy.
• Two independent PID temperature controllers for heating temperature control.
• Fully automatic sample insertion device and shielding door device.
• Equipped with upper burner and movable lower burner.
• Imported rotameter used to adjust gas flow for upper and lower burners.
• Movable T-type calibration burner device and flow controller.
• Imported Japanese methane mass flow controller automatically used for thermopile temperature calibration.
• Water-cooled heat flux meter for measuring incident radiant heat flux on the exposed surface, with self-circulating cooling system and no external water supply required.
• Airflow temperature control device provides constant-temperature and constant-flow air to the test chamber.

Measurement System

• Imported Medtherm thermopile heat flux meter for setting the radiant level on the sample surface, with water-cooling system for protection. Design range 0 to 100 kW/m2, accuracy ±3 percent, repeatability ±0.5 percent.
• Orifice flow meter used to measure flow pressure entering the test chamber.
• Imported micro differential pressure sensor with accuracy ±1 percent FS, hysteresis ±0.1 percent FS, and maximum linear pressure 69 kPa.
• Computer with Labview data acquisition system and standard heat release rate test software.

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