To investigate the influence of swirling air flow field on spray characteristics and droplet behaviors swirl cup airblast fuel injector, a single swirler double swirlers injector were operated in wide range mass rates (mf) relative pressure drops (ΔPa). Various laser based diagnostics, including planar Mie scattering, phase-Doppler particle analyzer, high speed imaging velocimetry, employed to provide information angle, Sauter mean diameter (SMD), velocity, velocity. The results show that...

Currently, steady-state analysis predominates in combustion chamber design, while dynamic characteristics remain underexplored, and there is a lack of comprehensive index system to assess behavior. This study conducts numerical simulation the chamber, employing method combining large eddy (LES) Flamelet Generated Manifold (FGM). The inlet air temperature, flow rate, fuel rate were varied by 1%, 2%, 3%, respectively, with pulsation period 0.008 s. effects nine different parameter pulsations...

In order to reduce NOx emissions, modern gas turbines are often equipped with lean-burn combustion systems, where the high-velocity fuel-lean conditions that limit formation in combustors also inhibit ability of ignition, high altitude relight, and lean stability. To face these issues, internally staged scheme fuel injection is proposed. Primary main staging enable distribution control, multi-injections lead a fast efficient mixing. A fuel-staged low emission combustor framework developed...

In order to reduce NOx emissions, modern gas turbines are often equipped with lean-burn combustion systems, where the high-velocity fuel-lean conditions that limit formation in combustors also inhibit ability of ignition, high altitude relight, and lean stability. To face these issues, internally staged scheme fuel injection is proposed. Primary main staging enable distribution control, multi-injections leads a fast efficient mixing. A fuel-staged low emission combustor framework developed...

Lean Blow Out (LBO) poses a significant safety hazard when occurring in aero-engines. Understanding the lower stability limits of gas turbine combustors and characteristics spray flame close to LBO are imperative for safe operation. The objective this work is evaluate effects fuel decreasing rates pressure drops injector on performances multi-swirl staged combustor equipped with an airblast injector. A set hardware control system was developed realize user-defined supply law. High-speed...

This work focuses on optimizing the flame stability by matching primary spray with swirling air streams in swirl cup which is used as pilot stage of a lean-burn fuel injector. Two configures pressure-swirl atomizer for have been investigated their ignition and lean blowout (LBO) performances, new designed decrease fuel–air ratio ( f/ a) limit about 35%, capability LBO greatly improved decreasing from 0.015 to 0.005. Furthermore, order relate characteristics combustion performances working...

This study was dedicated to introducing a new method for predicting the Sauter mean diameter (SMD) buildup in swirl cup airblast fuel injector. There have been considerable difficulties with SMD mainly because of complicated flow characteristics spray. Therefore, backpropagation (BP) neural network-based machine learning applied prediction as function geometry, condition parameters, and axial distance such primary number, secondary venturi angle, mass rate fuel, relative air pressure....

This experimental study investigated the influence of different turbine guide vane parameters on ignition limit and light-round processes in a triple-dome combustor. It was found that for combustor, minimum fuel/air ratios at all show trend initial decrease followed by subsequent increase with growth incoming air mass flow rate. The ratio decreases blockage ratio, optimal scheme is achieved 0.8. Under condition where rate 0.089 kg/s, time combustor without vanes shorter than other schemes....

Spray characteristics of a pressure-swirl atomizer are investigated using high-speed shadowgraph technique under different pressure drops (Δ P) and fuel temperatures ( T). An image processing method is developed MATLAB. The results illustrate that the mass flow rate climbs with increase Δ P, while discharge coefficient C d ) decreases firstly then P. P has larger effect on cone angle relative to temperature. With shape liquid film changes from ‘onion’ ‘tulip’ finally be fully spray cone....

The low NOX emission technology has become an important feature of advanced aviation engine. A wide range applications attempt to take advantage the fact that staged combustion operating under lean-premixed-prevaporized (LPP) conditions can significantly decrease pollution emissions and improve efficiency. In this paper a scheme with fuel centrally multi-point injection is proposed. mixing air improved, flame temperature typically in zone, minimizing formation nitrogen oxides (NOX),...

The lean blow-out performance of the pilot flame in a stratified partially premixed injector is studied this work considering influence main stage stratifier length. Particle image velocimetry and kerosene planar laser-induced fluorescence experiments at nonreacting conditions were carried out to give an explanation combustion performance. evolutions spray velocity space are discussed detail find inherent correlations stability, distribution, flow structures. Moreover, special attentions...

Aero-engine combustors may experience extreme low pressures in the case of an in-flight shutdown, which makes study aviation kerosene flame propagation characteristics at important. The present work examined during combustion over pressure range from 25 to 100 kPa using a constant-volume bomb apparatus. laminar burning speeds different initial pressures, temperatures and equivalence ratios were measured compared. In addition, numerical simulations used examine reaction sensitivity speed...

Abstract Central recirculation zone (CRZ) is commonly formed in the near field of injector exit by vane swirler and used to stabilize flame. In our experiment, a CRZ induced DBD plasma actuation was observed low swirl burner configuration for first time, which clearly demonstrated that mechanism combustion control mainly through aerodynamic effect. Three dielectric barrier discharge (DBD) actuators are placed circular array around axis generate ionic wind circumferential direction injector....

In order to reduce NOx emissions, modern gas turbines are often equipped with lean burn combustion systems, where the high-velocity fuel-lean conditions that limit formation in combustors also inhibit ability of ignition, high altitude relight, and stability. To face these issues, an internally staged scheme fuel injection is proposed. The pilot main staging enable distribution control turn-down ratio, multi-injections leads a fast efficient fuel/air mixing. A fuel-staged low emission...