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Field Test of Contra-Rotating Small Hydroturbine
Toru Shigemitsu,Takumi Omori,Yuya Hiraishi,Takashi Tsuda,Takayuki Kawanami,Kenji Hiranuma,Takuji Hosotani,Ding Nan 한국유체기계학회 2023 International journal of fluid machinery and syste Vol.16 No.2
The contra-rotating small hydroturbine can be applied to pipelines of agricultural water and for farming river fishes. In the previous research, the advantages of the contra-rotating small hydroturbine were verified by the numerical analysis and experimental apparatus of our lab. The diameter of our test model was small as 58mm and it have to be scaled up to apply it to the actual case of a pipeline for farming river fishes. Therefore, we made the diameter of our test model larger, which is suitable for the pipeline for farming river fishes. The numerical analysis was conducted to check the power of the large-scale model for the pipeline. Furthermore, the parameter study related to the solidity, blade number and setting angle, was conducted to increase the power of the hydroturbine using the numerical analysis. After that, the suitable impeller for the field test was chosen and an experimental apparatus for the field test was established. The power generation at different flow rate conditions was measured by the experiment and the stability of the experimental apparatus; leakage flow from the mechanical seal, vibration, noise of the turbine, was checked in the field test. In this paper, our developing process of the contra-rotating small hydroturbine is shown and the prospect to apply our test turbine for the pipelines is discussed based on the numerical analysis and field test results.
Ha, Soojin,Ahn, Il Young,Kim, Da-eun,Lee, Jong Kwon,Sohn, Soojung,Jung, Mi-Sook,Heo, Yong,Omori, Takashi,Bae, SeungJin,Lim, Kyung-Min Elsevier 2017 Regulatory toxicology and pharmacology Vol.85 No.-
<P><B>Abstract</B></P> <P>Recently UN GHS has introduced the sub-categorization of skin sensitizers for which ECt (concentration estimated to induce stimulation index above threshold) of the murine local lymph node assay (LLNA) is used as criteria. Non-radioisotopic variants of LLNA, LLNA: DA, LLNA: BrdU-ELISA, LNCC and LLNA: BrdU-FCM were developed yet their utilities for potency sub-categorization are not established. Here we assessed the agreement of LLNA variants with LLNA or human data in potency sub-categorization for 22 reference substances of OECD TG429. Concordance of sub-categorization with LLNA was highest for LLNA: BrdU-FCM(91%, κ = 0.833, weighted kappa) followed by LLNA: BrdU-ELISA (82%, κ = 0.744) and LLNA: DA (73%, κ = 0.656) whereas LNCC only showed a modest association (64%, κ = 0.441). With human data, LLNA agreed best (77%) followed by LLNA: DA and LLNA: BrdU-FCM(73%), LLNA: BrdU-ELISA (68%) and LNCC(55%). Bland-Altman plot revealed that ECt's of LLNA variants largely agreed with LLNA where most values fell within 95% limit of agreement. Correlation between ECt's of LLNA and LLNA variants were high except for LNCC(pair-wise with LLNA, LLNA: DA, <I>r</I> = 0.848, LLNA: BrdU-ELISA, <I>r</I> = 0.744, LLNA: BrdU-FCM, <I>r</I>=0.786, and LNCC, <I>r</I> = 0.561 by Pearson). Collectively, these results demonstrated that LLNA variants exhibit performance comparable to LLNA in the potency sub-categorization although additional substances shall be analyzed in the future.</P> <P><B>Highlights</B></P> <P> <UL> <LI> LLNA and LLNA variants were assessed for potency subcategorization of skin sensitizers. </LI> <LI> LLNA and LLNA variants were compared with human data for 22 reference chemicals. </LI> <LI> LLNA variants exhibit performances comparable to LLNA (55–73% vs 77%). </LI> </UL> </P>