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Modeling and Simulation of Flow Transients Inside a Multi-Stage Axial-Centrifugal Compressor
Modeling and Simulation of Flow Transients Inside a Multi-Stage Axial-Centrifugal Compressor
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105515
- ISBN
- 9798263337063
- DDC
- 621
- 저자명
- Jing, Zhenhao.
- 서명/저자
- Modeling and Simulation of Flow Transients Inside a Multi-Stage Axial-Centrifugal Compressor
- 발행사항
- [Sl] : Georgia Institute of Technology, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 203 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: A.
- 주기사항
- Advisor: Prasad, J. V. R.;Neumeier, Yedidia.
- 학위논문주기
- Thesis (Ph.D.)--Georgia Institute of Technology, 2024.
- 초록/해제
- 요약Unsteady simulations of compressors remain of great interest in compressor design and analysis. While the three-dimensional Navier-Stokes solvers are computationally expensive now and in the near future, the reduced order model is still the backbone of tools supporting early design stages, especially for unsteady simulations. Compressor mean line flow models are common tools for steady-state analysis and the design of multi-stage axial and centrifugal compressors. However, unsteady flow models using the mean line approach are not common, and the reason is that the blade aerodynamic force distribution is mostly perpendicular to the mean line, and typical dynamic models would lack a force source term to balance the adverse pressure gradient. In this work, an unsteady mean line flow model for multi-stage axial and centrifugal compressors is developed, where the blade rows, i.e., rotors and stators, are modeled as successive diffusing stream tubes in their own stationary or rotating reference frames. Thus, the compressor flow is "driven" by the added velocity at frame transformations instead of being driven by a user-input aerodynamic force, which is perpendicular to the flow direction.The developed mean line flow model features a series of physics-based modeling approaches that distinguishes itself from most unsteady compressor models. The aforementioned frame transformations between stationary and rotating reference frames are accommodated by inter-domain boundary conditions (interfaces), which allow acoustic waves to propagate the discontinuity in flow properties created by the frame transformation. Such a discontinuity accommodated by the interfaces is also used as a compact loss zone to include various loss models intended to capture the individual physical phenomenon. Thus, the energy addition at frame transformations and the loss models jointly predict the compressor aerodynamic performance, hence removing the need for user-input compressor performance.A series of steady-state and unsteady simulations are performed and presented. Several sensitivity studies on selected individual loss models are presented for steady-state simulations to reveal their influence. During compressor rig tests, the flow transients are simulated to investigate the surge process and choke/unchoke response. A novel rig test approach enabling measurement of equilibrium characteristics on the unstable side is proposed and simulated. In order to simulate compressor flow transient in real working conditions in a gas-turbine engine, a lumped-parameter combustor-turbine model is developed and coupled with the compressor model. Such an approach enabled the simulation of gas turbine transients, including fast engine acceleration and deceleration and the effects of heat transfer in those engine transients. A novel active energy management strategy, which uses an electric starter/generator (ES/G) to enhance gas turbine acceleration, is proposed and simulated. A similar approach using ES/G to assist recovery from surges is also examined by simulation, and the necessary ES/G power for such a task is evaluated.
- 일반주제명
- Heat transfer
- 일반주제명
- Turbines
- 일반주제명
- Aerodynamics
- 일반주제명
- Energy management
- 일반주제명
- Design
- 일반주제명
- Pressure distribution
- 일반주제명
- Acoustics
- 일반주제명
- Gas turbines
- 일반주제명
- Aerospace engineering
- 일반주제명
- Thermodynamics
- 기본자료저록
- Dissertations Abstracts International. 87-05A.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105515
■006m o d
■007cr#unu||||||||
■020 ▼a9798263337063
■035 ▼a(MiAaPQ)AAI32309294
■035 ▼a(MiAaPQ)GeorgiaTech75304
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a621
■1001 ▼aJing, Zhenhao.
■24510▼aModeling and Simulation of Flow Transients Inside a Multi-Stage Axial-Centrifugal Compressor
■260 ▼a[Sl]▼bGeorgia Institute of Technology▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a203 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: A.
■500 ▼aAdvisor: Prasad, J. V. R.;Neumeier, Yedidia.
■5021 ▼aThesis (Ph.D.)--Georgia Institute of Technology, 2024.
■520 ▼aUnsteady simulations of compressors remain of great interest in compressor design and analysis. While the three-dimensional Navier-Stokes solvers are computationally expensive now and in the near future, the reduced order model is still the backbone of tools supporting early design stages, especially for unsteady simulations. Compressor mean line flow models are common tools for steady-state analysis and the design of multi-stage axial and centrifugal compressors. However, unsteady flow models using the mean line approach are not common, and the reason is that the blade aerodynamic force distribution is mostly perpendicular to the mean line, and typical dynamic models would lack a force source term to balance the adverse pressure gradient. In this work, an unsteady mean line flow model for multi-stage axial and centrifugal compressors is developed, where the blade rows, i.e., rotors and stators, are modeled as successive diffusing stream tubes in their own stationary or rotating reference frames. Thus, the compressor flow is "driven" by the added velocity at frame transformations instead of being driven by a user-input aerodynamic force, which is perpendicular to the flow direction.The developed mean line flow model features a series of physics-based modeling approaches that distinguishes itself from most unsteady compressor models. The aforementioned frame transformations between stationary and rotating reference frames are accommodated by inter-domain boundary conditions (interfaces), which allow acoustic waves to propagate the discontinuity in flow properties created by the frame transformation. Such a discontinuity accommodated by the interfaces is also used as a compact loss zone to include various loss models intended to capture the individual physical phenomenon. Thus, the energy addition at frame transformations and the loss models jointly predict the compressor aerodynamic performance, hence removing the need for user-input compressor performance.A series of steady-state and unsteady simulations are performed and presented. Several sensitivity studies on selected individual loss models are presented for steady-state simulations to reveal their influence. During compressor rig tests, the flow transients are simulated to investigate the surge process and choke/unchoke response. A novel rig test approach enabling measurement of equilibrium characteristics on the unstable side is proposed and simulated. In order to simulate compressor flow transient in real working conditions in a gas-turbine engine, a lumped-parameter combustor-turbine model is developed and coupled with the compressor model. Such an approach enabled the simulation of gas turbine transients, including fast engine acceleration and deceleration and the effects of heat transfer in those engine transients. A novel active energy management strategy, which uses an electric starter/generator (ES/G) to enhance gas turbine acceleration, is proposed and simulated. A similar approach using ES/G to assist recovery from surges is also examined by simulation, and the necessary ES/G power for such a task is evaluated.
■590 ▼aSchool code: 0078.
■650 4▼aHeat transfer
■650 4▼aTurbines
■650 4▼aAerodynamics
■650 4▼aEnergy management
■650 4▼aDesign
■650 4▼aPressure distribution
■650 4▼aAcoustics
■650 4▼aGas turbines
■650 4▼aAerospace engineering
■650 4▼aThermodynamics
■690 ▼a0389
■690 ▼a0986
■690 ▼a0538
■690 ▼a0454
■690 ▼a0348
■71020▼aGeorgia Institute of Technology.
■7730 ▼tDissertations Abstracts International▼g87-05A.
■790 ▼a0078
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360378▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


