High-Level Power Extraction from Adaptive Cycle Engine for Directed Energy Weapon

Meng, Xiangying; Yang, Xinyu; Chen, Min; Zhu, Zhili

doi:10.2514/6.2018-4518

Cited by 3 publications

(5 citation statements)

References 3 publications

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“…The need for temperature increases to meet the thru quirements provided in Table 2 is consistent with statements and findings in [7,12,1 In point 10, where the engine is limited by its maximum T4, HPT power extraction h adverse effect on engine net thrust, causing the net thrust decrease shown in Figure The engine is running at a higher T 4 to meet the higher power output required from the HPT as shown in Figure 5. The need for temperature increases to meet the thrust requirements provided in Table 2 is consistent with statements and findings in [7,12,16,25]. In point 10, where the engine is limited by its maximum T 4 , HPT power extraction has an adverse effect on engine net thrust, causing the net thrust decrease shown in Figure 4.…”

Section: Single Design Point Evaluationsupporting

confidence: 82%

“…In recent years, a lot of research has focused on Variable Cycle Engines (VCEs) [24] and, particularly, the Adaptive Cycle Engine (ACE) concept [25] that is currently being developed for the next generation fighter aircraft. The ACE and VCE concepts can be adapted to achieve high specific thrust at operating conditions when high thrust is required, without sacrificing fuel consumption at cruise.…”

Section: Introductionmentioning

confidence: 99%

“…A study on transient shaft power extraction using a VCE is presented in [26]. In [25], the ACE concept is evaluated as a means of providing high-level power extraction from both shafts for a Directed Energy Weapon (DEW). The studied ACE consists of a very sophisticated three-stage fan with several variable areas called Convertible Fan Stage (CFS), which divides the flow into three different bypass flows.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design Considerations of Low Bypass Ratio Mixed Flow Turbofan Engines with Large Power Extraction

Rosell¹,

Grönstedt

2022

Fluids

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The possibility of extracting large amounts of electrical power from turbofan engines is becoming increasingly desirable from an aircraft perspective. The power consumption of a future fighter aircraft is expected to be much higher than today’s fighter aircraft. Previous work in this area has concentrated on the study of power extraction for high bypass ratio engines. This motivates a thorough investigation of the potential and limitations with regards to performance of a low bypass ratio mixed flow turbofan engine. A low bypass ratio mixed flow turbofan engine was modeled, and key parts of a fighter mission were simulated. The investigation shows how power extraction from the high-pressure turbine affects performance of a military engine in different parts of a mission within the flight envelope. An important conclusion from the analysis is that large amounts of power can be extracted from the turbofan engine at high power settings without causing too much penalty on thrust and specific fuel consumption, if specific operating conditions are fulfilled. If the engine is operating (i) at, or near its maximum overall pressure ratio but (ii) further away from its maximum turbine inlet temperature limit, the detrimental effect of power extraction on engine thrust and thrust specific fuel consumption will be limited. On the other hand, if the engine is already operating at its maximum turbine inlet temperature, power extraction from the high-pressure shaft will result in a considerable thrust reduction. The results presented will support the analysis and interpretation of fighter mission optimization and cycle design for future fighter engines aimed for large power extraction. The results are also important with regards to aircraft design, or more specifically, in deciding on the best energy source for power consumers of the aircraft.

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Section: Single Design Point Evaluationsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design Considerations of Low Bypass Ratio Mixed Flow Turbofan Engines with Large Power Extraction

Rosell¹,

Grönstedt

2022

Fluids

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show abstract

“…A detailed evaluation of the transient characteristics of the engine can provide support for engine flow path matching, control system design, and blade tip clearance design [20]. At present, to meet the evaluation requirements of ACE transition-state characteristics, scholars have established transition-state performance calculation models and analyzed the transition-state characteristics [17,[21][22][23][24][25][26][27][28][29]. Refs.…”

Section: Introductionmentioning

confidence: 99%

“…Refs. [21][22][23][24] focus on analyzing the impacts of heat exchangers, large-scale power extraction, and variable geometric parameters on the transient performance of ACEs. Ref.…”

Section: Introductionmentioning

confidence: 99%

Research on the Transient Characteristics of a Three-Stream Adaptive Cycle Engine

Yu,

Hu,

Wang

et al. 2023

Energies

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Based on the transient-performance calculation model of a dual-spool mixed-flow turbofan engine, this article improves the dynamic algorithm of geometric adjustment mechanisms and establishes a transient-performance calculation model suitable for a three-stream adaptive cycle engine (three-stream ACE). Using this model, the transient characteristics of a three-stream ACE were analyzed. The results indicate that the delay in the area of the fan nozzle significantly reduces the surge margin of the front fan during deceleration, while the delay in the angle of the front-fan and aft-fan guide vanes significantly reduces the surge margin of the front fan during acceleration, therefore becoming a limitation of the transient performance of the engine. At the same time, to meet the demand for equal-thrust mode switching, this article also proposes a mode-switching control scheme that solves the problem of engine state oscillation during the mode-conversion process and achieves a smooth conversion with thrust fluctuations within 1%. The research results of this article can guide the optimization design of three-stream ACE transition-state control laws and the design of control system architecture, which has important engineering significance.

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Design method of optimal control schedule for the adaptive cycle engine steady-state performance

Tang

Chen

2022

Chinese Journal of Aeronautics

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High-Level Power Extraction from Adaptive Cycle Engine for Directed Energy Weapon

Cited by 3 publications

References 3 publications

Design Considerations of Low Bypass Ratio Mixed Flow Turbofan Engines with Large Power Extraction

Design Considerations of Low Bypass Ratio Mixed Flow Turbofan Engines with Large Power Extraction

Research on the Transient Characteristics of a Three-Stream Adaptive Cycle Engine

Design method of optimal control schedule for the adaptive cycle engine steady-state performance

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