“…Depending on the intended application, the jets could be made to oppose via impinging, or via suction ows to produce either compressional or extensional ows, respectively. 230,231 The concept was originally conceived as a premixed ame stabilization technique, [232][233][234] due to the uniform strain rate inherent in the ow produced by the counter jets 235,236 which is normally not the case for a regular ame surface. 237,238 According to Schaffer and Cambel, 232 the stability of the ame so maintained, is ascribed to the existence of a small reaction zone around the stagnation point of the jet.…”