Accession Number : ADA461265


Title :   Branch Detonation of a Pulse Detonation Engine With Flash Vaporized JP-8


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING


Personal Author(s) : Slack, John D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a461265.pdf


Report Date : Dec 2006


Pagination or Media Count : 99


Abstract : Pulse Detonation Engines (PDE) operating on liquid hydrocarbon fuels are limited to operating frequencies of 35 Hz due to long ignition times from a low energy ignition sources. This study shows ignition time of JP-8 can be nearly eliminated by igniting a thrust tube using a secondary detonation. A counter flow heat exchanger attached to a thrust tube utilized waste heat from the detonation process to heat JP-8 to supercritical conditions. The fuel flash vaporized when injected into the air stream of the engine. A detonation was produced by a spark in a 5 cm diameter, 1.37 m long tube. The detonation was then propagated in a 1.9 cm diameter crossover tube into the head of second thrust tube where a pressure transducer and hydroxyl (OH) sensor measured the combustion event. Branch detonation was performed over a range of equivalence ratios ranging from 1.05 to 1.3. Branch ignited thrust tubes have shown 40% improvement in deflagration to detonation transition (DDT) time and a slight improvement in DDT distance.


Descriptors :   *PRESSURE TRANSDUCERS , *HEAT EXCHANGERS , *IGNITION , *DETONATIONS , *DEFLAGRATION , SECONDARY , COMBUSTION , TRANSITIONS , WASTES , HYDROCARBONS , LOW ENERGY , AIR FLOW , THESES


Subject Categories : Organic Chemistry
      Electrical and Electronic Equipment
      Combustion and Ignition


Distribution Statement : APPROVED FOR PUBLIC RELEASE