Direct-connect supersonic nozzle design considering the effect of combustion

Sung, Bu-Kyeng; Jeong, Se–Young; Choi, Jeong‐Yeol

doi:10.1016/j.ast.2022.108094

Cited by 9 publications

(5 citation statements)

References 9 publications

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“…The following assumptions were made: The steam flow within the nozzle was characterized by high velocity, short residence time, and negligible heat exchange with the surrounding environment. As a result, the steam flow could be treated as an adiabatic process Apart from the nozzle inlet, the steam flowing through the nozzle could be described by the ideal gas equation of state.…”

Section: New Design Methods Of a Supersonic Steam Injection Nozzlementioning

confidence: 99%

“…The steam flow within the nozzle was characterized by high velocity, short residence time, and negligible heat exchange with the surrounding environment. As a result, the steam flow could be treated as an adiabatic process …”

Section: New Design Methods Of a Supersonic Steam Injection Nozzlementioning

confidence: 99%

“…As a result, the steam flow could be treated as an adiabatic process. 40 Apart from the nozzle inlet, the steam flowing through the nozzle could be described by the ideal gas equation of state. This assumption allowed for simplified calculations and analysis of the steam flow behavior.…”

Section: New Design Methods Of a Supersonic Steam Injection Nozzlementioning

confidence: 99%

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New Design Method of a Supersonic Steam Injection Nozzle and Its Numerical Simulation Verification

Wang,

Pang,

Tian

et al. 2023

ACS Omega

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Steam huff-n-puff in horizontal wells often had limitations, such as uneven steam injection and low reservoir utilization. To improve steam injection efficiency, a new method for designing a supersonic nozzle was proposed based on the principles of aerodynamics and thermodynamics. The nozzle featured a tapering section, a throat, and a diverging section. The best geometric shape of the tapering section was the Witoszynski curve. A set of nozzle size designs were established, and the size parameters were optimized. The results showed that the nozzle could inject steam into the formation at supersonic speed and it had the characteristics of constant flow rate and uniform development of the steam chamber. According to the steam Reynolds number and the good aggregation distribution characteristics of the size design model, three sequential nozzles of 3.0, 5.0, and 6.5 mm were formed based on the throat. When the throat diameter was 5.0 mm, the tapering length was 4.3 mm, the diverging length was 5.5 mm, the throat length was 3.0 mm, the inlet diameter was 9.8 mm, and the outlet diameter was 6.2 mm. Numerical simulations indicated that the pressure drop loss during steam huff-n-puff injection in horizontal wells was within 10%. It was of great significance to establish the nozzle size design model of the steam injection effect of horizontal wells.

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Section: New Design Methods Of a Supersonic Steam Injection Nozzlementioning

confidence: 99%

Section: New Design Methods Of a Supersonic Steam Injection Nozzlementioning

confidence: 99%

See 1 more Smart Citation

New Design Method of a Supersonic Steam Injection Nozzle and Its Numerical Simulation Verification

Wang,

Pang,

Tian

et al. 2023

ACS Omega

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“…Therefore, as shown in Figure 4 and Table 2, the geometric design variables of the upstream section of the nozzle throat were defined and designed. The design process was covered in detail in a study by Sung et al [21,22]. The nozzle has a 130 mm length, a Ø 40 mm inlet, and a 20 × 20 mm rectangular outlet.…”

Section: Vitiation-air-heater Experimental Modelmentioning

confidence: 99%

“…Therefore, as the exit Mach number is a function of an area ratio (Equation ( 2)) the Mach numbers were measured at an exit pressure of 0.1 MPa, which did not form expansion shocks at the exit. The specific heat ratio 𝛾 applied to Equations ( 1) and ( 2) is 1.29 [22].…”

Section: Exit Mach Number Measurement: Pc = 0789 Mpamentioning

confidence: 99%

A Study on a Vitiated Air Heater for a Direct-Connect Scramjet Combustor and Preliminary Test on the Scramjet Combustor Ignition

Lee

Han

et al. 2023

Aerospace

Self Cite

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Vitiation air heater (VAH) combustion characteristics for a direct-connect scramjet combustor (DCSC) were experimentally studied. The VAH consists of a head, modular chamber, and circular-to-rectangular shape transition (CRST) nozzle. The CRST nozzle transforms the circular cross-sectioned rocket-type VAH into a rectangular cross-sectioned scramjet combustor. The CRST nozzle exit Mach numbers at the top, middle, and bottom were measured using a tungsten wedge. The oblique shock formed by the wedge was captured using Schlieren visualization and recorded with a high-speed camera. The θ-β-M relation showed that the exit Mach number was 2.04 ± 0.04 with a chamber pressure of 1.685 ± 0.07 MPa. With the VAH design point verified, preliminary scramjet combustor ignition tests were conducted. As the fuel was not auto-ignited by the vitiated air, the forced ignition method, in which VAH ignition flame ignites the scramjet fuel, was used. The Schlieren images showed that a cavity shear layer combustion mode was formed and also showed that the forced ignition method could be used as a reference model for the ignitor-ignition method.

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Numerical study on the combustion characteristics and performances of single and multi-injectors in a scramjet combustor

Jeong,

Kim,

Kim

et al. 2024

Aerospace Science and Technology

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Direct-connect supersonic nozzle design considering the effect of combustion

Cited by 9 publications

References 9 publications

New Design Method of a Supersonic Steam Injection Nozzle and Its Numerical Simulation Verification

New Design Method of a Supersonic Steam Injection Nozzle and Its Numerical Simulation Verification

A Study on a Vitiated Air Heater for a Direct-Connect Scramjet Combustor and Preliminary Test on the Scramjet Combustor Ignition

Numerical study on the combustion characteristics and performances of single and multi-injectors in a scramjet combustor

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