Experimental study on measurement and calculation of heat flux in supersonic combustor of scramjet

Zhang, Cong; Yao, Zhanli; Qin, Jiang; Bao, Wen

doi:10.1007/s11630-015-0781-3

Cited by 14 publications

(4 citation statements)

References 10 publications

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“…In addition, the engine of a hypersonic vehicle experiences a complex excitation structure, combustion pulsation, and oscillation in the supersonic combustion chamber. The local heat flux in the combustion chamber can easily reach an order of magnitude of 100 W/cm 2 , causing a significant thermal shock in the combustion chamber [12,13]. Therefore, timely, rapid and accurate information about the heat flow and its distribution on the external surface of equipment is very important when it comes to finding solutions and countermeasures.…”

Section: Introductionmentioning

confidence: 99%

High-Sensitivity and -Stability Thin-Film Heat Flux Sensor Based on Transverse Thermoelectric Effec

Chen,

Wang,

et al. 2023

Coatings

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In this study, we investigate the sensitivity properties of YBa2Cu3O7-δ thin films with a 15° tilting angle in relation to heat flux density. The films were prepared using the laser pulsed deposition (PLD) technique, and their characteristics were evaluated using various techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), atomic force microscopy (AFM), and infrared steady-state and laser transient calibration systems. The YBa2Cu3O7-δ films prepared in this study were found to be of good quality, exhibiting a single-phase structure with strict (001) orientation. Both the substrate and film diffraction peaks were sharp and consistent with the step-flow growth mode, indicating high crystalline quality. Ultra-high sensitivity in the range of 0 to 100 kW/m2, the maximum sensitivity is 230 μV/(kW/m2), and an uncertainty is only 3%. According to the infrared steady-state heat flux calibration system test, when the single output power of the quartz lamp array is 0.2 kW, 0.3 kW, 0.4 kW and 0.5 kW, the maximum output voltage is 0.19 mV, 0.41 mV, 0.63 mV and 0.94 mV, respectively, indicating that the output voltage of the sensor increases with the increase in heat flux, showing a good linear characteristic, and the fitting linearity is 0.99. Through the test of the laser transient thermal current calibration system, the sensors are found to have excellent response–recovery characteristics at 500 kHz and 1000 kHz fiber laser frequencies, and the maximum voltage output is 8.83 mV and 9.09 mV, respectively. Moreover, the component has excellent repeatability, and the maximum measurement error is only 1.94%. Our findings demonstrate the potential of YBa2Cu3O7-δ thin films for use in heat flux sensing applications.

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Section: Introductionmentioning

confidence: 99%

High-Sensitivity and -Stability Thin-Film Heat Flux Sensor Based on Transverse Thermoelectric Effec

Chen,

Wang,

et al. 2023

Coatings

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“…The mass flow rate of the inlet is q m = 3 g/s ( v in = 1.05 m/s), and the temperature of the inlet is T in = 373 K. The boundary of the outlet is set as the pressure outlet of p = 5 Mpa. According to the experimental results from Zhang et al, the peak heat flux of combustor sidewalls can be more than 2000 kW/m 2 . Therefore, q = 1500 kW/m 2 and q = 2000 kW/m 2 are chosen as two typical heat fluxes.…”

Section: Simulation Models and Boundary Conditionsmentioning

confidence: 99%

Numerical Investigation of the Thermal Behavior of Cracked RP-3 in Rectangular Cooling Channels under Different Inclinations

Jiang

et al. 2022

ACS Omega

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The pyrolysis effect of aviation kerosene is common in the regenerative cooling process of hypersonic aircraft scramjets. To find out the effect of inclination variation on the characteristics of aviation kerosene RP-3 considering thermal cracking in a regenerative cooling rectangular channel, a detailed chemical mechanism of RP-3 pyrolysis is introduced to construct a numerical model. The results indicate that the pyrolytic reaction begins at the junction of the heating wall and the side walls, and the main products of pyrolysis are light olefins and alkanes. The thermal cracking reaction slows down the velocity of the main flow on account of the increased density and increased viscosity resulting from the decrease in RP-3 temperature. With the decrease in inclination, thermal cracking is enhanced and the average heat transfer coefficient is decreased, which leads to an increase in wall temperature.

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“…The combustion heat release and aerodynamic heating of the SCRamjet differ in different engine components, which leads to the nonuniform wall heat flux in the flow direction [55]. As shown in Figure 14a, nine axially nonuniform heat flux distributions with the same average value (1.2 MW/m 2 ) and degree of nonuniformity (Φ = q fmax /q fmin = 2) are deployed to simulate the nonuniform heat flux boundary in the SCRamjet.…”

Section: Heat Transfer Under Axially Nonuniform Heat Fluxmentioning

confidence: 99%

“…It can be seen that various experimental and numerical studies have been carried out to study the flow and heat transfer characteristics of hydrocarbon fuel at supercritical pressure. However, the wall heat flux in the SCRamjet is usually nonuniform [55], which exhibits a distinct effect on heat transfer. For example, the heat flux of the combustor wall is usually highest because of the combustion heat release.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Heat Transfer of n-Decane in a Horizontal Channel with Axially Nonuniform Heat Flux under Supercritical Pressure

et al. 2022

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Regenerative cooling is considered promising in the thermal protection of hypersonic propulsion devices such as SCRamjet. However, the heat transfer deterioration (HTD) of hydrocarbon fuel is a severe threat to the thermal structure safety, especially under axially nonuniform heat flux caused by the thermal load difference in different components. In this work, the heat transfer of trans-critical n-decane in a mini-horizontal channel is numerically investigated. The influences of the axially nonuniform heat flux on the heat transfer is focused on. Two types of HTD are recognized and analyzed. The first type of HTD is induced by the near-wall flow acceleration and the local thickening of the viscous sublayer. The second type of HTD is closely related to the expansion of the low thermal conductivity λ and specific heat cp region, which is seriously worsened under axially nonuniform heat flux, especially when the heat flux peak locates where Tw ≥ Tpc. The minimum HTC deteriorates by 40.80% and the Tw_max increases from 857 K to 1071 K by 27.5%. The maximum fluctuation in pressure drop is 6.8% in the variation in heat flux distribution with Φ = 2. This work is expected to offer a reference to the proper match of fuel temperature distribution and the engine heat flux boundary in SCRamjet cooling system design.

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Experimental study on measurement and calculation of heat flux in supersonic combustor of scramjet

Cited by 14 publications

References 10 publications

High-Sensitivity and -Stability Thin-Film Heat Flux Sensor Based on Transverse Thermoelectric Effec

High-Sensitivity and -Stability Thin-Film Heat Flux Sensor Based on Transverse Thermoelectric Effec

Numerical Investigation of the Thermal Behavior of Cracked RP-3 in Rectangular Cooling Channels under Different Inclinations

Numerical Investigation on the Heat Transfer of n-Decane in a Horizontal Channel with Axially Nonuniform Heat Flux under Supercritical Pressure

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