Relation of Fuels to Aircraft Turbine Engines

Methods of Estimating the Quality of Jet Fuels

“…8 In the case of fuel JP-6 according to specification Mil-F-25656 the pressure drop should not be more than 250 mm Hg at a heater temperature of 204° and a filter temperature of 260°. 27 In evaluating the thermal stability on the Erdco apparatus the formation of a small quantity of deposit in the heater is allowed.…”

“…Therefore, in order to estimate the ability of the fuels to cause burnout of the fire tubes of the combustion chamber, a laboratory device was developed for estimating this from the brightness of the flame. 8 It was established from studies that the brightness of the flame depends on the amount of bicyclic aromatic hydrocarbons of the naphthalene series in the fuel. Proceedings from this fact, the Pratt & Whitney Company limited the amount of bicyclic aromatic hydrocarbons in the experimental high-boiling fuel PWA-522 to not more than 3%-8 The determination of the total quantity of aromatic hydrocarbons in jet fuels and the separate determination of the amount of bicyclic aromatic and unsaturated hydrocarbons is accomplished by the chromatographic method.…”

Relation of Luminometer Number to Molecular Structure and Smoke Point.

“…Recently, Pratt and Whitney Aircraft Division of United Aircraft Corp. developed a new instrument for measuring combustion quality (9). Under the auspices of the Coordinating Research Council (CRC) it has evolved into a new test method, the CRC luminometer (2), which may supplant all present combustion control tests.…”