Effectiveness of oyster shell as alkali additive for two-stage anaerobic co-digestion: Carbon flow analysis

Energy ◽  
2022 ◽  
Vol 239 ◽  
pp. 122177
Author(s):  
Peni Astrini Notodarmojo ◽  
Takeshi Fujiwara ◽  
Habuer ◽  
Dinh Pham Van
Keyword(s):  
Flow Analysis ◽  
Oyster Shell ◽  
Carbon Flow ◽  
Two Stage

Space–Time Gradient Method for Unsteady Bladerow Interaction—Part II: Further Validation, Clocking, and Multidisturbance Effect

2015 ◽  
Vol 137 (12) ◽  
Author(s):  
L. He ◽  
J. Yi ◽  
P. Adami ◽  
L. Capone
Keyword(s):  
Case Studies ◽  
Flow Analysis ◽  
Space Time ◽  
Inlet Temperature ◽  
Turbine Stage ◽  
Two Stage ◽  
Transonic Compressor ◽  
Surface Time ◽  
Blade Row ◽  
Speed Up

For efficient and accurate unsteady flow analysis of blade row interactions, a space–time gradient (STG) method has been proposed. The development is aimed at maintaining as many modeling fidelities (the interface treatment in particular) of a direct unsteady time-domain method as possible while still having a significant speed-up. The basic modeling considerations, main method ingredients and some preliminary verification have been presented in Part I of the paper. Here in Part II, further case studies are presented to examine the capability and applicability of the method. Having tested a turbine stage in Part I, here we first consider the applicability and robustness of the method for a three-dimensional (3D) transonic compressor stage under a highly loaded condition with separating boundary layers. The results of the STG solution compare well with the direct unsteady solution while showing a speed up of 25 times. The method is also used to analyze rotor–rotor/stator–stator interferences in a two-stage turbine configuration. Remarkably, for stator–stator and rotor–rotor clocking analyses, the STG method demonstrates a significant further speed-up. Also interestingly, the two-stage case studies suggest clearly measurable clocking dependence of blade surface time-mean temperatures for both stator–stator clocking and rotor–rotor clocking, though only small efficiency variations are shown. Also validated and illustrated is the capacity of the STG method to efficiently evaluate unsteady blade forcing due to the rotor–rotor clocking. Considerable efforts are directed to extending the method to more complex situations with multiple disturbances. Several techniques are adopted to decouple the disturbances in the temporal terms. The developed capabilities have been examined for turbine stage configurations with inlet temperature distortions (hot streaks), and for three blade-row turbine configurations with nonequal blade counts. The results compare well with the corresponding direct unsteady solutions.

scholarly journals Carbon flow analysis and Carbon emission reduction of FCC in Chinese oil refineries

2017 ◽  
Vol 81 ◽  
pp. 012047
Author(s):  
Fengrui Jia ◽  
Na Wei ◽  
Danzhu Ma ◽  
Guangxin Liu ◽  
Ming Wu ◽  
...  
Keyword(s):  
Emission Reduction ◽  
Carbon Emission ◽  
Flow Analysis ◽  
Carbon Flow ◽  
Carbon Emission Reduction ◽  
Oil Refineries

Aerodynamic interaction of turbines in a regulated two-stage turbocharging system

2021 ◽  
pp. 095440702110647
Author(s):  
Mingyang Yang ◽  
Lei Pan ◽  
Mengying Shu ◽  
Kangyao Deng ◽  
Zhanming Ding ◽  
...  
Keyword(s):  
Entropy Generation ◽  
Internal Combustion Engines ◽  
Swirling Flow ◽  
Flow Analysis ◽  
Low Pressure ◽  
Two Stage ◽  
Operational Conditions ◽  
Low Pressure Turbine ◽  
Bypass Valve ◽  
Turbocharging System

Two-stage turbocharging becomes prevailing in internal combustion engines due to its advantage of flexibility of boosting for the variation of operational conditions. Two turbochargers are closely coupled by engine manifolds in the system especially under the requirement of compactness. This paper studies the influence of the interaction of two turbines in a two-stage turbocharging system on the performance. Results show that the performance of low-pressure turbine is highly sensitive to the stage interaction. Specifically, compared with the cases without interaction, the efficiency of low-pressure turbine increases maximumly by 2.8% when the bypass valve is closed, but reduces drastically by 7.5% when the valve is open. Detailed flow analysis shows that the combined results of swirling flow from the high-pressure turbine and the Dean vortex caused by the manifold elbow result in the alleviation of entropy generation in the turbine rotor. However, when the bypass valve is open, interaction of the swirling flow with the injected bypass flow results in strong secondary flow in the volute and distorted inlet flow condition for the rotor, leading to the enhancement of entropy generation in low-pressure turbine. The study provides valuable insights into turbine performance in a two-stage turbocharging system, which can be used for the modeling and optimization of multi-stage turbocharging systems.

Investigation of 3D Unsteady Flows in a Two Stage Shrouded Axial Turbine Using Stereoscopic PIV and FRAP: Part I — Interstage Flow Interactions

2006 ◽  
Author(s):  
L. Porreca ◽  
Y. I. Yun ◽  
A. I. Kalfas ◽  
S. J. Song ◽  
R. S. Abhari
Keyword(s):  
Flow Field ◽  
Measurement Techniques ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Fast Response ◽  
Design Flow ◽  
Main Stream ◽  
Two Stage ◽  
Axial Turbine ◽  
Improved Design

A detailed flow analysis has been carried out in a two-stage shrouded axial turbine by means of intrusive and non-intrusive measurement techniques. Multi-sensor Fast Response Aerodynamic Probe (FRAP) and 3D-PIV system were applied at two locations downstream of the first and second rotors. Several radial planes were measured focusing on the blade tip region in order to obtain a unique set of steady and unsteady velocity data. The investigation deals with the aerodynamics and kinematics of flow structures downstream of the first and second rotors and their interaction with the main flow in a partially shrouded turbine typical of industrial application. The first part of this work is focused on the flow field downstream of the first rotor while the second part studies the leakage flow in the cavity of the second rotor and its interaction with the main stream. The interstage region is characterized by interactions between the tip passage vortex and a vortex caused by the recessed shroud platform design. Flow coming from the blade passage suddenly expands and migrates radially in the cavity region causing a localized total pressure drop. The time evolution of these vortical structures and the associated downstream unsteady loss generation are analyzed. The partial shroud design adopted in this geometry is beneficial in terms of blade stress and thermal load; however flow field downstream of the first rotor is highly three dimensional due to the intense interaction between cavity and main streams. A flow interpretation is provided and suggestions for improved design are finally addressed based on the steady and unsteady flow analysis.

Analysis of low-carbon industrial symbiosis technology for carbon mitigation in a Chinese iron/steel industrial park: A case study with carbon flow analysis

Energy Policy ◽  
2013 ◽  
Vol 61 ◽  
pp. 1400-1411 ◽  
Author(s):  
Hui Zhang ◽  
Liang Dong ◽  
Huiquan Li ◽  
Tsuyoshi Fujita ◽  
Satoshi Ohnishi ◽  
...  
Keyword(s):  
Flow Analysis ◽  
Carbon Flow ◽  
Industrial Park ◽  
Industrial Symbiosis ◽  
Low Carbon ◽  
Carbon Mitigation

Comparison Between Single and Two-Stage Anaerobic Digestion of Vegetable Waste: Kinetics of Methanogenesis and Carbon Flow

2019 ◽  
Vol 11 (11) ◽  
pp. 6095-6103
Author(s):  
Dinh Pham Van ◽  
Fujiwara Takeshi ◽  
Giang Hoang Minh ◽  
Song Toan Pham Phu
Keyword(s):  
Anaerobic Digestion ◽  
Carbon Flow ◽  
Vegetable Waste ◽  
Two Stage ◽  
Kinetics Of
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