Parametric study of power turbine for diesel engine waste heat recovery

Zhao, Rongchao; Zhuge, Weilin; Zhang, Yangjun; Yin, Yueping; Chen, Zhen; Li, Zhigang

doi:10.1016/j.applthermaleng.2014.03.032

Cited by 53 publications

(18 citation statements)

References 24 publications

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“…Then, the power ratio, Sw can be determined by using Equation 4. In the preliminary LPT design process, an approximate initial value for the total-to-static turbine efficiency, of 0.75 was imposed into the calculation of Sw. …”

Section: (3)mentioning

confidence: 99%

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Design methodology of a low pressure turbine for waste heat recovery via electric turbocompounding

Mamat

Martinez-Botas

Rajoo

et al. 2016

Applied Thermal Engineering

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This paper presents a design methodology of a high performance Low Pressure Turbine (LPT) for turbocompounding applications to be used in a 1.0 L “cost-effective, ultra-efficient heavily downsized gasoline engine for a small and large segment passenger car”. Under this assumption, the LPT was designed to recover the latent energy of discharged exhaust gases at low pressure ratios (1.05–1.3) and to drive a small electric generator with a maximum power output of 1.0 kW. The design speed was fixed at 50,000 rpm with a pressure ratio, PR of 1.08. Commercially available turbines are not suitable for this purpose due to the very low efficiencies experienced when operating in these pressure ratio ranges. By fixing all the LPT requirements, the turbine loss model was combined with the geometrical model to calculate preliminary LPT geometry. The LPT features a mixed-flow turbine with a cone angle of 40° and 9 blades, with an inlet blade angle at radius mean square of +20°. The exit-to-inlet area ratio value is approximately 0.372 which is outside of the conventional range indicating the novelty of the approach. A single passage Computational Fluid Dynamics (CFD) model was applied to optimize the preliminary LPT design by changing the inlet absolute angle. The investigation found the optimal inlet absolute angle was 77°. Turbine off-design performance was then predicted from single passage CFD model. A rapid prototype of the LPT was manufactured and tested in Imperial College turbocharger testing facility under steady-state and pulsating flow. The steady-state testing was conducted over speed parameter ranges from 1206 rpm/K0.5 to 1809 rpm/K0.5. The test results showed a typical flow capacity trend as a conventional radial turbine but the LPT had higher total-to-static efficiency, ηt-s in the lower pressure ratio regions. A maximum total-to-static efficiency, ηt-s of 0.758 at pressure ratio, PR ≈ 1.1 was found, no available turbines exist in this range as parameters. A validation of the predicted single passage CFD analysis for the off-design performance against the LPT test result found a minimum total-to-static efficiency Standard Deviation of ±0.026 points for the speed parameter of 1507 rpm/K0.5. A minimum Mass Flow Parameter Standard Deviation of ±0.091 kg/s K0.5 bar is found at 1206 rpm/K0.5

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Section: (3)mentioning

confidence: 99%

“…The mass flow rate is determined from Sw of Equation 4. Therefore, the inlet radius at the hub and shroud can be determined from equations 8 and 9, where γ was set at 70˚.…”

Section: Constant Efficiency Regions Correlation Curve Between ψ and mentioning

confidence: 99%

Design methodology of a low pressure turbine for waste heat recovery via electric turbocompounding

Mamat

Martinez-Botas

Rajoo

et al. 2016

Applied Thermal Engineering

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“…Thus, it causes additional fuel consumption. On the other hand, almost 70% of the fuel energy is released to the atmosphere as a waste heat [1]. Waste heat driven ejector refrigeration system is one of the best promising way to obtain air conditioning.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Ejector Refrigeration System Powered with Engine Exhaust Heat using R134a and R245fa

Yılmaz¹,

Aktaş²

2019

European Mechanical Science

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An ejector refrigeration (ER) system using exhaust waste heat of a heavy vehicle engine is investigated. A program is developed using engineering equation solver software and it is used to make the calculations of the system. The system is taking all the efficiencies of system's components into account. Refrigerants R134a and R245fa are used for the comparative simulation of the system. The pressure at the exit of the pump is varied from 6 to 14 MPa and 3 to 10 MPa for R134a and R245fa, respectively. It can be concluded that COP (coefficient of performance) of the system gradually increases with the increase in pump exit pressure. Results show that, the performance of the system would be higher if R245fa is preferred rather than R134a with the given operating conditions.

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“…At present, the major wasted heat recovery technologies are mainly as followed: turbocharging, turbo compound generator (also called turbocompounding), Brayton cycle, Rankine engine cycle and thermoelectric generators [1][2][3][4][5][6][7]. Among them, the turbocompounding technology converts the waste energy into electric or mechanical energy by gas turbine.…”

Section: Introduction mentioning

confidence: 99%

Gas Turbine Design and Matching Research of Waste Heat Recovery System for Marine Diesel Engine

Jie¹,

Zhang²,

Gu³

et al. 2019

JMEA

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With the emphasis on energy and environmental protection, energy-conservation and emission-reduction become vital issues for industrial development. Moreover, with the development of legislation on marine environment, the marine diesel engine has become focusing on energy saving and emission reduction for ships. For low-speed diesel engines under high load, waste heat from exhaust gas can be recovered by the compact and efficient gas turbine. In this paper, the matching design research between low speed diesel engine and gas turbine is carried out. To balance efficiency and compactness, the impeller was adjusted and generated by ANSYS BLADEGEN, based on 1D thermodynamic design. And the 1D calculation is similar to the ANSYS CFX simulation result: the total-static efficiency is 73.8% compared to 76.7%. Moreover, the flow separation happened at the impeller suction side and created vortex due to the high incidence angle. The off-design operating point simulation of the turbine shows though the pressure ratio increase will cause the efficiency to decline a little, the total shaft power rises. In sum, this paper worked out a power turbine suitable for a low-speed diesel engine according to the turbine character matching design and simulation, which provides foundation to the construction of a steady operation of waste heat recovery system for marine diesel engine.

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Parametric study of power turbine for diesel engine waste heat recovery

Cited by 53 publications

References 24 publications

Design methodology of a low pressure turbine for waste heat recovery via electric turbocompounding

Design methodology of a low pressure turbine for waste heat recovery via electric turbocompounding

Comparative Analysis of Ejector Refrigeration System Powered with Engine Exhaust Heat using R134a and R245fa

Gas Turbine Design and Matching Research of Waste Heat Recovery System for Marine Diesel Engine

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