Modification to the Langley 8-Foot High Temperature Tunnel for hypersonic propulsion testing

Reubush, D. E.; Puster, Richard L.; Kelly, H. N.

doi:10.2514/6.1987-1887

Cited by 9 publications

(1 citation statement)

References 1 publication

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“…The ejection mixing layer [1] is an important mechanism of mass, momentum and energy exchange in the process of ejector active flow and passive flow mixing. Industrial refrigeration [2], propulsion system [3], high-energy laser pressure recovery system [4], hypersonic ground test equipment [5], and other research focus. The development and mixing efficiency of jet mixing layer have always been the focus of the research on ejection mixing.…”

Section: Introductionmentioning

confidence: 99%

Study on the relationship between the length of mixing layer and the characteristic scale of mixing layer in multi-strut ejector

Zhou

2022

J. Phys.: Conf. Ser.

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The flow structure of the multi-strut ejector based on jet segmentation has an obvious relationship with the transverse characteristic scale of the jet. Therefore, this paper studies the relationship between jet transverse characteristic size and mixing layer. Through the simulation of multi-strut ejectors with different number of struts, the development of mixing layer in the mixing process of jets with different transverse characteristic sizes is compared under the same boundary conditions. It is concluded that when there is no obvious coupling effect between the mixing layer and the shock & expansion wave, there is a linear relationship between the transverse characteristic scale of the jet and the mixing length of the flow direction, and the jet mixing with different transverse characteristic scales is consistent. When the shockwaves and expansion waves are strongly coupled with the mixing layer, the linear relationship between the jet transverse characteristic scale and the mixing layer length is not strong.

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Section: Introductionmentioning

confidence: 99%

Study on the relationship between the length of mixing layer and the characteristic scale of mixing layer in multi-strut ejector

Zhou

2022

J. Phys.: Conf. Ser.

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Study on post-processing method of supersonic mixing layer simulation results based on streamline tracking

Zhou

2022

AIP Advances

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On the time-average, the direction of the mixing layer midline remains essentially the same, with rich conclusions under the Cartesian coordinate system (CCS). However, the static pressure mismatch state of the jet leads to a strong coupling effect of expansion and compression in the mixing process. This causes the midline of the mixing layer to become irregularly curved in shape. It is not convenient to describe with fixed CCS anymore. Therefore, a post-processing method of the flow field is proposed based on streamline tracing using the Lagrangian viewpoint to establish a coordinate system for mixing layer evaluation based on the streamline as the coordinate axis, which is called the Followed Body Coordinate System (FBCS) in this study. The following conclusions are obtained for the velocity thickness, momentum thickness, and Pitot pressure thickness treated by FBCS, and they are in good agreement with each other. In addition, the correction of Pitot pressure thickness after two methods of processing is less than 0.08, and the scalar thickness is insensitive to the choice of coordinate system. The consistency of the corrected velocity thickness and momentum thickness is significantly enhanced. This is due to the fact that the processing in FBCS significantly reduces the effects of airflow velocity and density variations caused by flow expansion and compression. The problem of inaccurate vector thickness evaluation in this state is improved.

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Benefits and Technical Challenges of Downhole Steam Generation for Enhanced Oil Recovery

2011

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Steam generated at the surface is currently the most common technology for in-situ thermal stimulation of heavy oil, however it has significant limitations due to heat loss that make it uneconomic for some 2 trillion barrels of deeper heavy oil resources. Downhole steam generators (DHSGs) have the ability to unlock these deeper deposits and allow steam to be used where it was previously not economical. A brief review of recent advances in DHSG technology and a description of potential applications using thermal oil recovery modeling and simulation are presented here. The DHSG technology described can be particularly suitable for recovering a number of known heavy oil deposits around the world that have experienced low recovery efficiencies through primary and secondary (water flood) production methods. These deeper resources typically require thermal stimulation to reduce viscosity in-situ for improved production volumes. Cost estimates and economic projections were developed based on a full green field project using production estimates obtained from STARS, a widely accepted heavy oil simulation program. Simulations and associated economic studies for the fields modeled, assuming the deployment of DHSGs, showed viable economics for all cases at both USD $75/bbl and USD $100/bbl 2009 WTI oil prices. The technological constraints of deep heavy oil production may be removed by further development of DHSG technology including direct-fired, umbilical-supported downhole natural gas fired systems that can be operated without maintenance for long periods of time. DHSG technology development activities are presented and specific issues relating to previous unsuccessful efforts are discussed. Finally, a new generation of DHSG technology is introduced and key design and operating problems with proposed solutions are presented. The uniqueness of the downhole environment is discussed along with the special requirements imposed on a downhole combustion system as a result. Technical challenges include tool positioning and inaccessibility, installation and operational safety, pressure management, and flame stability & control. Advances from the aerospace industry are also discussed as they pertain to robust combustion system development and downhole tool design which help enable a broad range of operating pressures and flow rate turndown. The demonstrated potential for DHSG technology to create optimum steam and EOR gas mixes that are tailored for a given reservoir may provide the basis for a new generation of thermal in-situ EOR technology to unlock deep heavy oil resources as well as those in environmentally challenged locales such as offshore or under arctic or permafrost environments.

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Modification to the Langley 8-Foot High Temperature Tunnel for hypersonic propulsion testing

Cited by 9 publications

References 1 publication

Study on the relationship between the length of mixing layer and the characteristic scale of mixing layer in multi-strut ejector

Study on the relationship between the length of mixing layer and the characteristic scale of mixing layer in multi-strut ejector

Study on post-processing method of supersonic mixing layer simulation results based on streamline tracking

Benefits and Technical Challenges of Downhole Steam Generation for Enhanced Oil Recovery

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