Design and performance analysis of a supercritical CO2 radial inflow turbine

Zhou, Kehan; Wang, Jiangfeng; Xia, Jiaxi; Guo, Yumin; Zhao, Pan; Dai, Yiping

doi:10.1016/j.applthermaleng.2019.114757

Cited by 26 publications

(10 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Noall and Pasch [46] estimated a realistically achievable compressor isentropic efficiency of 83% to 85% for a 50 MW plant. The total-to-static efficiency of the 1.16 MW s-CO 2 turbine modelled in [47] was 85.4%, which is consistent with the size and efficiency of the present study. The partial heating layout includes a single larger CO 2 turbine rather than two smaller turbines, which is beneficial in terms of the turbine efficiency.…”

Section: Decision Variables and Main Assumptionssupporting

confidence: 90%

On the Conceptual Design of Novel Supercritical CO2 Power Cycles for Waste Heat Recovery

Manente

Costa

2020

Energies

View full text Add to dashboard Cite

The supercritical CO2 power cycle (s-CO2) is receiving much interest in the utilization of waste heat sources in the medium-to-high temperature range. The low compression work and highly regenerative layout result in high thermal efficiencies, even at moderate turbine inlet temperatures. The capability of heat extraction from the waste heat source is, however, limited because the heat input takes place over a limited temperature range close to the maximum cycle temperature. Accordingly, novel s-CO2 layouts have been recently proposed, aimed at increasing the heat extraction from the heat source while preserving as much as possible the inherently high thermal efficiency. Among these, the most promising ones feature dual expansion, dual recuperation, and partial heating. This work concentrates on the conceptual design of these novel s-CO2 layouts using a systematic approach based on the superimposition of elementary thermodynamic cycles. The overall structure of the single flow split with dual expansion (also called cascade), partial heating, and dual recuperated cycles is decomposed into elementary Brayton cycles to identify the building blocks for the achievement of a high performance in the utilization of waste heat sources. A thermodynamic optimization is set up to compare the performance of the three novel layouts for utilization of high temperature waste heat at 600 °C. The results show that the single flow split with a dual expansion cycle provides 3% and 15% more power compared to the partial heating and dual recuperated cycles, respectively, and 40% more power compared to the traditional single recuperated cycle used as the baseline. The separate evaluation of thermal efficiency and heat recovery effectiveness shows the main reasons behind the achievement of the highest performance, which are peculiar to each novel layout.

show abstract

Section: Decision Variables and Main Assumptionssupporting

confidence: 90%

On the Conceptual Design of Novel Supercritical CO2 Power Cycles for Waste Heat Recovery

Manente

Costa

2020

Energies

View full text Add to dashboard Cite

show abstract

“…The results showed that the impeller tip clearance adversely affected turbine performance because of its small size. Zhou et al [50] also investigated the effect of tip clearance on turbine performance parameters, including isentropic efficiency and power output in a sCO2 centrifugal radial turbine. It also proved the negative effect on performance of increasing dimensionless tip clearances from 2% to 8%.…”

Section: Radial Turbinementioning

confidence: 99%

A comprehensive review of micro-scale expanders for carbon dioxide related power and refrigeration cycles

Tian

Pekris

2022

Applied Thermal Engineering

View full text Add to dashboard Cite

“…where A is the flow area at seal clearance, T t,c,in is total temperature at the seal cavity inlet, and π is a pressure ratio that is defined as π = P t,c,in /P c,out (10) where P t,c,in is total pressure at the seal cavity inlet. In addition, if the change in temperature of leakage flow can be neglected, computing formulation for the entropy increase can be simplified as…”

Section: Number Of the Seal Teethmentioning

confidence: 99%

“…Many institutions such as Sandia National Laboratory (SNL) [4,5], Bechtel Marine Propulsion Corporation [6,7] and Nuclear Power Institute of China [8] have investigated RIT performance through experiments. Other researchers, e.g., Zhou et al [9,10] and Unglaube et al [11] have conducted theoretical analyses or numerical simulations to clarify the flow mechanism in S-CO 2 RIT.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Labyrinth Seal Performance for the Impeller Backface Cavity of a Supercritical CO2 Radial Inflow Turbine

Yang¹,

Zhao²,

Zhang³

et al. 2021

Computer Modeling in Engineering &Amp; Sciences

View full text Add to dashboard Cite

For a radial inflow turbine (RIT), leakage flow in impeller backface cavity has critical impacts on aerodynamic performance of the RIT and axial force acting on the RIT impeller. In order to control this leakage flow, different types of labyrinth seals are numerically studied in this paper based on a supercritical carbon dioxide (S-CO 2 ) RIT. The effects of seal clearance and cavity outlet pressure are first analyzed, and the impacts of seal design parameters, including height, number and shape of seal teeth, are evaluated. Results indicate that adding labyrinth seal can improve cavity pressure and hence adequately inhibits leakage flow. Decreasing the seal clearance and increasing the height of seal teeth are beneficial to improve sealing performance, and the same effect can be obtained by increasing the number of seal teeth. Meanwhile, employing seals can reduce leakage loss and improve RIT efficiency under a specific range of cavity outlet pressure. Finally, the influences of seal types on the flow field in seal cavity are numerically analyzed, and results demonstrate that isosceles trapezoidal type of seal cavity has better sealing performance than triangular, rectangular and right-angled trapezoidal seal cavities.

show abstract

Design and performance analysis of a supercritical CO2 radial inflow turbine

Cited by 26 publications

References 29 publications

On the Conceptual Design of Novel Supercritical CO2 Power Cycles for Waste Heat Recovery

On the Conceptual Design of Novel Supercritical CO2 Power Cycles for Waste Heat Recovery

A comprehensive review of micro-scale expanders for carbon dioxide related power and refrigeration cycles

Numerical Analysis of Labyrinth Seal Performance for the Impeller Backface Cavity of a Supercritical CO2 Radial Inflow Turbine

Contact Info

Product

Resources

About