Entropy Production Analysis and Fluid–Structure Refinement of a Stepless Stratified Intake
Jiahuan Qi, Ke Liu, Xingen Wang, Jianping Zhao, Jun Li
TL;DR
This study uses entropy production to analyze energy loss in a stepless stratified intake system and suggests design improvements to reduce inefficiencies.
Contribution
The paper introduces entropy production as a diagnostic tool for analyzing energy dissipation in stepless stratified intakes and proposes effective geometric modifications.
Findings
Turbulent entropy production accounts for over 98% of total dissipation in the intake system.
Flow turning at gate leaves and wake development around braces are the main sources of energy loss.
A combined brace-alignment and edge-rounding design reduces dissipation hotspots and improves discharge sharing.
Abstract
Thermal stratification in deep reservoirs can cause ecologically problematic cold-water releases, and many existing selective-withdrawal phenomena rely on a limited set of fixed intake levels, which constrains their ability to follow seasonal shifts in the thermocline. Stepless stratified intakes with continuously adjustable flap gates offer quasi-continuous control of withdrawal depth, but their multi-gate, multi-brace layouts generate complex internal hydraulics whose energy-loss mechanisms are not well captured by conventional head-loss and resistance-coefficient metrics. In this study, physical-model measurements are combined with a validated three-dimensional numerical model, and entropy-production theory is used as a diagnostic to resolve where and by which mechanisms mechanical energy is irreversibly degraded inside a single-unit stepless stratified intake. The analysis shows…
Click any figure to enlarge with its caption.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18
Figure 19
Figure 20
Figure 21
Figure 22
Figure 23
Figure 24
Figure 25
Figure 26
Figure 27
Figure 28Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsHydraulic flow and structures · Dam Engineering and Safety · Hydrology and Sediment Transport Processes