Aerodynamic design method of micro-scale radial turbines considering the effect of wall heat transfer

Li, Zhenpeng; Zou, Zhengping; Yao, Lichao; Fu, Chao; Lei, Bian; Zhang, Weihao

doi:10.1016/j.applthermaleng.2018.04.051

Cited by 9 publications

(1 citation statement)

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“…MT combustors should provide a high air/gas mixing quality with sufficient residence time needed for the low calorific fuels to complete the combustion as well as uniform outlet temperature distribution [8]. MT combustors also control the micro turbine's work output, the level of the emissions and the turbine operating temperature [9]. Accurate design of the combustor could mitigate the problems of autoignition, dynamic or static instability, keep temperature profiles, NOx and CO emissions within allowable limits, curtail the flame encroachment to the rim of the flame holder, and promise the long life of the MT components.…”

Section: Introductionmentioning

confidence: 99%

Design, manufacture and test of a micro-turbine renewable energy combustor

Bazooyar

Darabkhani

2020

Energy Conversion and Management

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The ever-increasing demand on highly efficient decentralized power generation with low CO2 emission has made microturbines for power generation in micro-combined heat and power (mCHP) generation systems popular when running on biofuels as a renewable source of energy. This document presents a state-of-the-art design, and optimization (in terms of design, performance and emission control) of a micro-turbine renewable energy combustor that fits into the existing Bladon 12kWe recuperated microturbine plenum while running on a range of biofuels as it can successfully provide the required power of the mCHP. Governing equations for in-depth analysis of the combustor consist of manufacturer empirical data to simulate system-level operation with respect to replacement of the fossil with biofuels. The Model developed and validated at company's ISO conditions confirms the output power of the new combustor fits the conventional system with slight eco-energy improvements. The modeling of the combustor in a complete microturbine assembly system is performed, then was utilized to further analysis of the microturbine with the designed combustor. The experimental results gave on average 46.7% electrical efficiency, 83.2% system efficiency, 12 kWe electrical power, and 90% recuperator effectiveness at nominal operating conditions of microturbine (MT). Sensitivity analyses evaluate changes in performance with respect to fuel phase (e.g., liquid or gaseous) and design variables (e.g., orientation, shape, and dimensions of combustor), leading to energy optimization of the unit.Experimental findings demonstrate that the combustor in microturbine can meet the target performance specifications of a company conventional diesel microturbine with significant savings. An objective function including both combustor and recuperator technical energy data is defined for finding the best ratio of fuel and air and their flow rates to find the most effective operating points for the operation of MT. Annual time series simulations completed for Coventry, West Midlands, United Kingdom indicate a new combustor can reduce operational costs of diesel 3 fuel combustor by 8%, 2%, 36%, and 25% when supplying bioethanol, DME, biogas, and NG, respectively. Annual operating time of the renewable microturbine combustor at rated capacity included an 11% reduction in exergy loss with biogas fuel relative to diesel fuel.

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Section: Introductionmentioning

confidence: 99%