Measurement of the pressure distribution on two model propellers / by Stuart D. Jessup.

Jessup, Stuart D.

doi:10.5962/bhl.title.47357

Cited by 14 publications

(14 citation statements)

References 2 publications

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“…In Fig. 6, it shows that calculation results of pressure distribution agree well with the test results [12]. Especially, in central area of blade, the two results are almost consistent.…”

Section: Analysis Of Open Water Performancesupporting

confidence: 75%

Numerical analysis of propeller exciting force in oblique flow

Wang

Sun

et al. 2017

J Mar Sci Technol

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Liquid densityInstantaneous value of velocity in j directionRelative pressureRelative inflow velocityOblique flow velocity Propeller rotation angular velocity Oblique flow angle Circumferential position of blade = Θ − arctanPropeller thrust coefficient Abstract CFD commercial software FLUENT, based on solving RANS equations, was used to calculate propeller hydrodynamic performance and exciting force. Sliding grid technique was applied to simulate the propeller rotation. Different advance coefficients and oblique inflow angles were set as different working conditions through adjusting inflow magnitude and direction. DTMB4679 propeller as the research object, hydrodynamic performance of this propeller in oblique flow was first calculated, and agreed well with test results. It verifies the accuracy of calculation method. The time-domain data of propeller exciting force under different working conditions was monitored, and then spectrum curve was obtained through fast Fourier transform. The results show that propeller load in oblique flow will aggravate, and transverse velocity component of oblique flow will cause great transverse force generated by propeller. Moreover, the smaller advance coefficient causes the greater peak of propeller fluctuating pressure. Additionally, oblique flow angle has a greater influence on unsteady bearing force than fluctuating pressure.

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“…In Fig. 6, it shows that calculation results of pressure distribution agree well with the test results [12]. Especially, in central area of blade, the two results are almost consistent.…”

Section: Analysis Of Open Water Performancesupporting

confidence: 75%

Numerical analysis of propeller exciting force in oblique flow

Wang

Sun

et al. 2017

J Mar Sci Technol

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“…(Flacourtiaceae) is an understorey tree of about 40 m high. It is endemic to rain forest areas of north-east Queensland [1] between 200 and 800 m [2]. No previous phytochemical studies have been reported on this species.…”

Section: Introductionmentioning

confidence: 99%

Three new 3-benzylbenzofuran-2-one derivatives fromHomalium brachybotrys(Flacourtiaceae/Salicaceaes. l.)

Mosaddik¹,

Forster²,

Waterman³

2007

Natural Product Research

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Eight phenolic compounds, including two mixtures of two compounds, were isolated from the ethyl acetate extract of leaves and stems of Homalium brachybotrys. They were identified on the basis of spectroscopic data as quercetin-3-O-beta-glucopyranoside, luteolin-7-O-beta-glucopyranoside, 5,6-dihydro-6-beta-glucopyranosyloxy-3-(hydroxyphenyl-methyl)-2(4H)-benzofuranone (cochinolide 6-O-beta-glucopyranoside) (1), 2-(6-benzoyl-beta-glucopyranosyloxy)-5-hydroxybenzyl alcohol (poliothrysoside) (2), 2-(beta-glucopyranosyloxy)-5-hydroxybenzyl alcohol (salirepin) (3), 4,5-dihydro-7a-beta-glucopyranosyloxy-3-(hydroxyphenylmethyl)-2(7aH)-benzofuranone (isocochinolide-7a-O-beta-glucopyranoside) (4), 5,6-dihydro-3-(hydroxyphenylmethyl)-2(4H)-benzofuranone (6-deoxycochinolide) (5) and 3-benzylidine-6-hydroxy-2-benzofuranone (1'deoxy-4,5,6-dehydrocochinolide) (6). Benzofuranones (4), (5) and (6) are new natural products. The compounds isolated support the argument that Homalium is best placed in the Salicaceae s.l.

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“…These methods have allowed the determination of different levels of parthenolide in feverfew samples of different sources. Such approaches, however, ignore the presence of other active sesquiterpene lactones [5], which may contribute to the observed clinical efficacy of the plant either synergistically (positive effects) or sysergistically (negative effects) [6].…”

mentioning

confidence: 99%

Multi-Component Metabolic Classification of Commercial Feverfew Preparations via High-Field 1H-NMR Spectroscopy and Chemometrics

Bailey¹,

Sampson²,

Hylands³

et al. 2002

Planta med

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There is increasing interest in evaluating the clinical efficacy of herbal medicines. However, there are significant analytical problems associated with quality control and the measurement of the overall composition of such complex, multi-component mixtures as normally required in the pharmaceutical industry. Here we describe a novel NMR spectroscopic and pattern recognition analytical approach to investigate composition and variability of a commonly used herbal medicine. 600 MHz (1)H-NMR spectroscopy and principal components analysis (PCA) was used to discriminate between batches of 14 commercially available feverfew samples based on multi-component metabolite profiles. Two of the batches were significantly different from the other twelve. The twelve remaining classes could be classified into discrete groups by PCA on the basis of minor differences in overall chemical composition. NMR based pattern recognition (PR) analysis of extracts proved to be superior to PR analysis of HPLC traces of the same mixtures. This work indicates the potential value of NMR combined with PCA for the characterisation of complex natural product mixtures, and the discrimination of samples containing allegedly identical ingredients.

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Measurement of the pressure distribution on two model propellers / by Stuart D. Jessup.

Cited by 14 publications

References 2 publications

Numerical analysis of propeller exciting force in oblique flow

Numerical analysis of propeller exciting force in oblique flow

Three new 3-benzylbenzofuran-2-one derivatives fromHomalium brachybotrys(Flacourtiaceae/Salicaceaes. l.)

Multi-Component Metabolic Classification of Commercial Feverfew Preparations via High-Field 1H-NMR Spectroscopy and Chemometrics

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