The Role of Liquid Fuels Channel Configuration on the Combustion inside Cylindrical Mesoscale Combustor

Abstract

This research intended to investigate combustion of liquid fuel in 3.5 mm inner diameter quartz glass tube mesocombustor, based on liquid film evaporation by using heat recirculation. The mesocombustor has a copper section for heating and evaporating the liquid fuel. In mesocombustor type A, the fuel was glided through the narrow canal in the copper wall while the air was glided through the axial of combustor. The flame could only be successfully stabilized in high-ratio equivalent ranging from ¦ = 1.1 to ¦= 1.6, due to the gap without combustion reaction caused by high air-fuel mixture over the limits of flame stability. Mesocombustor type B, which has annulus-shaped canal, could shift the flame stability from ¦ = 0.8 to ¦ = 1.2; however, it also narrowed the limits of flame stability due to the wall cooling. In mesocombustor type C, both liquid fuel and air were glided through the annulusshaped canal in the copper wall to fix the fuel evaporation and air mixture. The flame of type C was successfully stabilized, from ¦ = 0.73 to ¦ = 1.48 wider than types A and B. The flame of type C mesocombustor is circle-shaped and fitted to cross section of mesocombustor, but it still has thin gap without any flames due to thermal quenching by the wall.

The use of heat circulator for flammability in mesoscale combustor

“…The aperture without flame (q) that divided the lean mixture from the wall was the result of the blackout by the wall and known as the quenching distance. The same phenomenon happened on the meso-combustor with copper recirculation section [14].…”

“…Combustion with thermal circulation itself consists of two kinds, first namely thermal circulation accompanied by gas circulation [2,10,[39][40][41][42][43], included the swiss-roll type combustor [2,[43][44][45][46]. The second one is combustion by thermal circulation without gas circulation [14,47] where heat is circulated to upstream for unburn gas preheating.…”

“…Even getting a stable combustion of liquid fuel in a micro/mesoscale combustor is a lot more problematic since there are transient phases of atomisation, evaporation, and mixing with an oxidant in a narrow combustion chamber. The preheating of liquid fuel requires an additional section or additional components or additional device or specific design [1,14,22,23,55].…”

“…What should be noted from the research is the use of copper as an essential component of the meso-combustor. Even though copper has high conductivity, it is easily deformed at high temperature [14]. Since it is easily deformed at high temperature, copper is rarely used as combustor material.…”

Experimental Study on the Effect of Nano Additives γAl2O3 and Equivalence Ratio to Bunsen Flame Characteristic of Biodiesel from Nyamplung (Calophyllum Inophyllum)

“…This happened because of the catalytic effect from nano γAl2O3. Catalysts have taken place in combustion under fuel-lean conditions [37].…”