Subsonic flow flameholder studies using a low pressure simulation technique

TLDR: In this article, the authors evaluated the usefulness of the nitrogen dilution technique of simulating low pressures in studying some of the variables affecting flame stabilization of bluff bodies and reported a powerful temperature effect in the range 280 to 625°K and an adverse effect of flameholder blockage above a critical value.

Abstract: Summary The object of the work described in this paper has been to evaluate the usefulness of the nitrogen dilution technique of simulating low pressures in studying some of the variables affecting flame stabilization of bluff bodies. Details are given of the theoretical background to the technique and the predicted relationship between simulated pressure and dilution quantity. Current low pressure experimental work is aimed at evaluating this relationship. The technique has been used to study the effect of temperature and blockage on the flameholding characteristics of 60° included angle cones under subsonic flow conditions. Although analysis of all the data obtained is incomplete, preliminary results indicate a powerful temperature effect in the range 280 to 625°K and an adverse effect of flameholder blockage above a critical value estimated at 9 per cent for these flameholders.