Staged turbocharging for high altitude IC engines

Loth, John L.; Morris, Gary J.; Metlapalli, P.

doi:10.2514/6.1997-3294

Cited by 7 publications

(3 citation statements)

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“…Lot at al. [11] presented the performance of a 60 kW Rotax 912 piston engine with a three-stage turbocharging, taking into account a three-valve control strategy and concluding that the system is applicable. It is also known the Rotax 912 singlestage turbo engine, which successfully lifted the Altus 1 aircraft to an altitude of 13.3 km.…”

Section: Introductionmentioning

confidence: 99%

Study of super/turbocharger system for helicopter diesel engine

Прохоренко¹,

Vrublevskyi²,

Grytsyuk³

et al. 2021

Diagnostyka

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The article demonstrates a rational scheme of the supercharging system in a helicopter diesel engine with a power of 100 kW, regardless of the flight altitude, and proposes a method for assessing the power losses for a diesel engine depending on the flight altitude using a mathematical model. There are three variants of an engine supercharger scheme with a single-stage turbocharger, a two-stage one with parallel or sequential compressor drive and a turbo-blower. As a result of the computational analysis according to the original method, it was shown that from the point of view of the least energy consumption two-stage scheme with a compressor and a sequential drive is the most rational. To reduce energy losses in the drive with two-stage supercharging, a concept for controlling the pressure system was proposed, which includes changing the rotational speed of the compressor drive and adjusting the throttles. Simulation of the engines running during the climb / descent of the helicopter showed that the proposed pressure scheme and control concept is effective. In order to improve the quality of regulation, the possibility to use an electric drive with the first stage compressor is being considered.

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Section: Introductionmentioning

confidence: 99%

Study of super/turbocharger system for helicopter diesel engine

Прохоренко¹,

Vrublevskyi²,

Grytsyuk³

et al. 2021

Diagnostyka

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“…Turbocharging is the key technology for power recovery of Internal Combustion Engine (ICE) at high altitude for long endurance unmanned aerial vehicle (UAV) [1,2]. Centrifugal compressor is the core component of a turbocharger.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on performance of centrifugal compressor exposed to pulsating backpressure

Shu

Yang

Zhang

et al. 2019

Aerospace Science and Technology

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Pressure fluctuations in intake manifold of Internal Combustion Engine introduce a pulsating boundary condition to the centrifugal compressor. In this study, the performance of centrifugal compressor exposed to pulsating backpressure is experimentally investigated. Unsteady performance and surge characteristic of the compressor at different pulsating conditions are analyzed. Results show that instantaneous performance of the compressor forms a hysteresis loop encapsulating steady performance. A correlation of compressor unsteadiness with pulse frequency, magnitude, and local slope of the characteristic curve is obtained based on measurements. Cycle-average performance of the compressor is notably lower than that at constant conditions. Specifically, the averaged peak efficiency at pulsating condition drops 3%~7%. Fast Fourier Transformation method is applied to study surge characteristics at pulsating conditions. Results manifest that compressor surge is postponed remarkably by pulsating backpressure at all conditions. As the compressor approaches to small mass flow rate, flow fluctuations decay quickly and then increase dramatically when the surge happens, forming the variation with 'V-shape' for frequency domains. This phenomenon is resulted from the influence of the slope of characteristic curve on the filling-empty and compressor stability. Smaller slope produces less filling-empty and hence smaller size of the loop, but reduces the stability of compressing system and initiates surge.

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“…Loth et al proved that the Rotax 912 engine with a three-stage valve control strategy had the highest latitude flying ability (Loth et al , 1997). In that year, they reached an altitude of 13.3 km by installing the engine on an Altus 1 UAV.…”

Section: Introductionmentioning

confidence: 99%

Keeping twin turbocharged engine power at flight altitudes

Khodaparast

Bozorg

Kheradmand

2018

AEAT

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Purpose The purpose of this paper is the selection and arrangement of turbochargers set for internal combustion engine which could keep engine power in an altitude of up to 12.2 km above sea level. Design/methodology/approach In the current research, the target engine, a one-dimensional four-stroke 1,600 cc piston engine has been simulated and the manufacturer’ results have been validated. Depending on engine size, three proper types of Garret turbochargers GT30, GT25 and GT20 were selected for this engine. Then, the engine and a combination of two turbochargers have been modeled one-dimensionally. A control system was used for regulation of different pressure ratios between the two turbochargers. Findings The parametric analysis shows that using the combination of GT20, GT30 turbochargers with a properly controlled pressure ratio leads to a constant output power with little changes at different altitudes which enable achieving an altitude of 12.2 km for the target engine. Practical implications Adaptation of the internal combustion engine with a twin turbocharger using one-dimensional modeling. Originality/value The one-dimensional analysis provided an overall picture of the effective performance of turbochargers functioning in different altitudes and loads. It presents a new method for adopting of turbochargers set with internal combustion engines for propulsion medium-altitude aircraft.

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Staged turbocharging for high altitude IC engines

Cited by 7 publications

References 0 publications

Study of super/turbocharger system for helicopter diesel engine

Study of super/turbocharger system for helicopter diesel engine

Experimental study on performance of centrifugal compressor exposed to pulsating backpressure

Keeping twin turbocharged engine power at flight altitudes

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