Combustion and Ignition of Thermally Cracked Kerosene in Supersonic Model Combustors

XJ, Fan; Gao, Yu; Li, JG

doi:10.2514/1.26402

Cited by 63 publications

(28 citation statements)

References 16 publications

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“…The working pressure of the aviation kerosene generally exceeds its critical pressure, above which no phase transition will occur. The state of an aviation kerosene changes from liquid state to supercritical state at the supercritical pressure with the increase of temperature, and then steps into thermal cracking state with further increase of temperature [3]. The specific heat capacity of supercritical fluid has a peak value when it varies with temperature at a supercritical pressure.…”

Section: Introductionmentioning

confidence: 99%

Convective heat transfer characteristics of China RP-3 aviation kerosene at supercritical pressure

Huai

Cai

et al. 2011

Applied Thermal Engineering

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a b s t r a c tRegenerative cooling of aviation kerosene plays an important role for thermal protection of scramjet engines. Since the thermophysical properties of kerosene change acutely near the pseudo-critical point, heat convective in kerosene pipe flow is complicated. Here the convective heat transfer characteristics of China RP-3 aviation kerosene at a supercritical pressure are numerically studied using the finite volume method. The RNG k-e two-equation turbulence model with enhanced wall treatment is considered. The heat transfer with different constant wall heat fluxes is analyzed, and a correlation of heat transfer enhancement is obtained. The effect of mass flow rate on the convective heat transfer with a varying wall heat flux condition at the supercritical pressure is also investigated. Because of the special thermophysical properties of the kerosene at supercritical pressure, the Nussult number is only related to the Reynolds number after the heat transfer is enhanced. The simulation results are compared with the empirical formulas in the literature.

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Section: Introductionmentioning

confidence: 99%

Convective heat transfer characteristics of China RP-3 aviation kerosene at supercritical pressure

Huai

Cai

et al. 2011

Applied Thermal Engineering

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“…Regenerative fuel cooling has been considered one of the most effective and practical methods for hydrocarbonfueled scramjets [1][2][3]. In a regenerative cooling system, before injection into combustor, the fuel flows through the cooling channels along the combustor wall, carrying away heat from the wall via heat convection and endothermic chemical reactions (thermal cracking) [4,5]. A challenge for regenerative cooling systems is that the amount of the fuel used as coolant must match that used for the combustion.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer of Aviation Kerosene at Supercritical Conditions

Zhong¹,

Fan²,

Gong³

et al. 2008

44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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The heat transfer characteristics of China no. 3 kerosene were investigated experimentally and analytically under conditions relevant to a regenerative cooling system for scramjet applications. A test facility developed for the present study can handle kerosene in a temperature range of 300-1000 K, a pressure range of 2.6-5 MPa, and a mass flow rate range of 10-100 g=s. In addition, the test section was uniquely designed such that both the wall temperature and the bulk fuel temperature were measured at the same location along the flowpath. The measured temperature distributions were then used to analytically deduce the local heat transfer characteristics. A 10-component kerosene surrogate was proposed and employed to calculate the fuel thermodynamic and transport properties that were required in the heat transfer analysis. Results revealed drastic changes in the fuel flow properties and heat transfer characteristics when kerosene approached its critical state. Convective heat transfer enhancement was also found as kerosene became supercritical. The heat transfer correlation in the relatively low-fuel-temperature region yielded a similar result to other commonly used jet fuels, such as JP-7 and JP-8, at compressed liquid states. In the high-fuel-temperature region, near and beyond the critical temperature, heat transfer enhancement was observed; hence, the associated correlation showed a more significant Reynolds number dependency.

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“…When the fuel temperature is sufficiently high, the fuel pyrolysis occurs as well [7]. Experimental results [6,8] demonstrated that the overall burning intensity as well as the combustion efficiency improved with supercritical/cracked kerosene injection. However, further enhancement in combustion efficiency was limited by the shorter penetration depth of supercritical/cracked kerosene due to the lower density.…”

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confidence: 92%

Characteristics of compressible flow of supercritical kerosene

et al. 2012

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In this paper, compressible flow of aviation kerosene at supercritical conditions has been studied both numerically and experimentally. The thermophysical properties of supercritical kerosene are calculated using a 10-species surrogate based on the principle of extended corresponding states (ECS). Isentropic acceleration of supercritical kerosene to subsonic and supersonic speeds has been analyzed numerically. It has been found that the isentropic relationships of supercritical kerosene are significantly different from those of ideal gases. A two-stage fuel heating and delivery system is used to heat the kerosene up to a temperature of 820 K and pressure of 5.5 MPa with a maximum mass flow rate of 100 g/s. The characteristics of supercritical kerosene flows in a converging-diverging nozzle (Laval nozzle) have been studied experimentally. The results show that stable supersonic flows of kerosene could be established in the temperature range of 730 K-820 K and the measurements in the wall pressure agree with the numerical calculation.

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Combustion and Ignition of Thermally Cracked Kerosene in Supersonic Model Combustors

Cited by 63 publications

References 16 publications

Convective heat transfer characteristics of China RP-3 aviation kerosene at supercritical pressure

Convective heat transfer characteristics of China RP-3 aviation kerosene at supercritical pressure

Heat Transfer of Aviation Kerosene at Supercritical Conditions

Characteristics of compressible flow of supercritical kerosene

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