Effect of transverse fuel injection system on combustion efficiency in scramjet combustor

A dry-low-NOx, high-airflow-capacity fuel injection system for a lean-premixed combustor has been developed for a moderate pressure ratio (20:1) aeroderivative gas turbine engine. Engine requirements for combustor pressure drop, emissions, and operability have been met. Combustion performance was evaluated at high power conditions in a high-pressure, single-nozzle test facility which operates at full baseload conditions. Single digit NOx levels and high combustion efficiency were achieved A wide operability range with no signs of flashback, autoignition, or thermal problems was demonsuated. NOx sensitivities 10 pressure and residence time were found to be small at flame temperatures below 1850 K (2870 F). Above 1850 K some NOx sensitivity to pressure and residence Lime was observed and was associated with the increased role of the thermal NOx production mechanism at elevated flame temperatures.

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A Novel Beetle-Inspired Fuel Injection System for Improved Combustion Efficiency

Lecture Notes in Mechanical Engineering - Innovative Design, Analysis and Development Practices in Aerospace and Automotive Engineering (I-DAD 2018) ◽

10.1007/978-981-13-2718-6_45 ◽

2018 ◽

pp. 467-475

Author(s):

R. Kuppuraj ◽

S. A. Pasupathy

Keyword(s):

Fuel Injection ◽

Combustion Efficiency ◽

Injection System ◽

Fuel Injection System

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Conical Grid Plate Flame Stabilizers for Combustor Primary Zones

Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations ◽

10.1115/85-gt-53 ◽

1985 ◽

Author(s):

A. F. Ali ◽

G. E. Andrews

Keyword(s):

Residence Time ◽

Fuel Injection ◽

Combustion Efficiency ◽

Shear Layers ◽

Injection System ◽

Fuel Injection System ◽

Nox Emissions ◽

Fuel Injector ◽

Primary Zone ◽

Grid Plate

Emission results are presented for a jet shear layer flame stabiliser design consisting of a 90° conical flame stabiliser with an array of holes and a central annular vaporiser fuel injection system. This design was tested with premixed propane and air and with direct propane injection into the vaporiser at two blockages and approach velocities. The results showed that an array of jet shear layers could be fuelled by a single fuel injector without incurring excessive NOx emissions. An increase in the primary zone residence time was found to result in an improved combustion efficiency, with no increase in NOx, provided that the stabiliser blockage was increased to maintain the pressure loss.

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Ignition Characteristics on the Annular Combustor With Rotating Fuel Injection System

Volume 1: Turbo Expo 2004 ◽

10.1115/gt2004-53233 ◽

2004 ◽

Author(s):

Kang Yeop Lee ◽

Seong Man Choi ◽

Yeoung-Min Han ◽

Jeong-Bae Park

Keyword(s):

Fuel Injection ◽

Combustion Efficiency ◽

Injection System ◽

Test Facility ◽

Ignition Process ◽

Fuel Injection System ◽

Shaft Speed ◽

Annular Combustor ◽

Ignition Characteristics ◽

Ignition And Combustion

An experimental study was performed to investigate the ignition characteristics on the annular combustor with rotating fuel injection system. The combustor was tested in KARI (Korea Aerospace Research Institute) combustor test facility. As the results of the test, equivalence ratio of lean ignition limit is 0.15 at 7,300 rpm and 0.08 at 10,400 rpm respectively. Combustion efficiency is gradually increased from 99.1% to 99.62% with increasing shaft speed from 15,000 rpm to 30,000 rpm. Over than 30,000 rpm, the combustion efficiency is not changed and kept constant. From the ignition and combustion test, ignition process of this annular combustor is mainly governed by the shaft speed. To understand the relationship between the spray characteristics and shaft speed, droplet size was measured by using PDPA system. In this spray test, Sauter mean diameter (SMD) largely depends on the shaft speed. SMD is changed from 73 μm to 42 μm with increasing the shaft speed from 5,000 rpm to 20,000 rpm.

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