Development of a Strip Method Proposed as New Standard for Propeller Performance Scaling

Streckwall, Heinrich; Greitsch, Lars; Müller, Julia; Scharf, Martin; Bugalski, Tomasz

doi:10.1179/str.2013.60.2.002

Cited by 13 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The strip method was proposed as early as 1994 by Praefke [14] and recently deployed by HSVA [18]. It should cover any blade shape, because surface friction effects are treated in an integral manner by dividing the blade into strips covering all sections between the hub and the tip.…”

Section: Hsva's Strip Methodsmentioning

confidence: 99%

The Effect of Propeller Scaling Methodology on the Performance Prediction

Helma¹,

Streckwall²,

Richter³

2018

Preprint

Self Cite

View full text Add to dashboard Cite

In common model testing practise, the measured values of the self propulsion test are split into the characteristics of the hull, the propeller and into the interaction factors. These coefficients are scaled separately to the respective full scale values and subsequently reassembled to give the power prediction. The accuracy of this power prediction depends {\em inter alia} on the accuracy of the measured values and the scaling procedure. An inherent problem of this approach is, that it is virtually impossible to verify each single step, because of the complex nature of the underlying problem. In recent years the scaling of the open-water characteristics of propeller model tests attracted a renewed interest, fuelled by competitive tests, which became the norm due to requests of the customer. This paper will show the influence of different scaling procedures on the predicted power. The prediction is compared to the measured trials data and the quality of the prediction will be judged. The procedures examined are the standard ITTC~1978 procedure plus derivatives of it: the Meyne, the strip method and the βᵢ-method.

show abstract

Section: Hsva's Strip Methodsmentioning

confidence: 99%

The Effect of Propeller Scaling Methodology on the Performance Prediction

Helma¹,

Streckwall²,

Richter³

2018

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…The strip method was developed by H. Streckwall of the HSVA model basin and published in 2013 [3]. When analysing the open-water test, the vector sum of the contributions of each radial section (strip) towards the friction resistance is calculated to get the friction resistance of the whole blade.…”

Section: Strip Methodsmentioning

confidence: 99%

A scaling procedure for modern propeller designs

Helma¹

2016

Ocean Engineering

View full text Add to dashboard Cite

The extrapolation procedures currently used to scale propeller characteristics tested at model scale to their full scale performances are either based on a statistical [1], the Lerbs-Meyne [2] or the recently developed strip method [3]. With the emergence of so-called unconventional propellers and different design strategies associated with them, it has been questioned whether the assumptions used in these scaling methods are still universally valid. E.g. with tip and root unloading employed, the circulation distribution deviates from the optimum, which is assumed by the Lerbs-Meyne method; more modern profiles show a different camber distribution and hence the drag coefficient must be aligned with the hydrodynamic inflow angle and not with the pitch to diameter ratio as assumed by the strip method (and implicitly by the ITTC 1978 method [4]). The work presented still uses the assumption of the equivalent profile and will explain a modified scaling procedure showing a way to calculate the hydrodynamic inflow angle solely from one open-water test conducted at a constant Reynolds number. Finally exemplary results comparing a propeller of conventional type with a recent propeller designs will also be shown. The new proposed method shows a superior performance when compared to other scaling methods.

show abstract

“…a Streckwall et al specified the Reynolds numbers of the transition point x t for the open-water condition as 4×10 5 (suction side) and 2×10 5 (pressure side), and for the behind condition as 3×10 5 (suction side) and 1×10 5 (pressure side) [9]. b In his presentation, Schulze has an obvious misprint when giving the value of 0.03 for the middle part [7].…”

Section: Friction Lines For Transition Regionmentioning

confidence: 99%

“…The strip method was proposed as early as 1994 by Praefke [3] and recently deployed by HSVA [9]. It should cover any blade shape, because surface friction effects are treated in an integral manner by dividing the blade into strips covering all sections between the hub and the tip.…”

Section: Hsva's Strip Methodsmentioning

confidence: 99%

The Effect of Propeller Scaling Methodology on the Performance Prediction

Helma¹,

Streckwall

Richter

2018

JMSE

Self Cite

View full text Add to dashboard Cite

In common model testing practise, the measured values of the self propulsion test are split into the characteristics of the hull, the propeller and into the interaction factors. These coefficients are scaled separately to the respective full scale values and subsequently reassembled to give the power prediction. The accuracy of this power prediction depends inter alia on the accuracy of the measured values and the scaling procedure. An inherent problem of this approach is that it is virtually impossible to verify each single step, because of the complex nature of the underlying problem. In recent years the scaling of the open-water characteristics of propeller model tests attracted a renewed interest, fuelled by competitive tests, which became the norm due to requests of the customer. This paper shows the influence of different scaling procedures on the predicted power. The prediction is compared to the measured trials data and the quality of the prediction is judged. The procedures examined are the standard ITTC 1978 procedure plus derivatives of it, the Meyne method, the strip method developed by the Hamburgische Schiffbau-Versuchsanstalt (HSVA) and the β i -method by Helma.

show abstract

Development of a Strip Method Proposed as New Standard for Propeller Performance Scaling

Cited by 13 publications

References 0 publications

The Effect of Propeller Scaling Methodology on the Performance Prediction

The Effect of Propeller Scaling Methodology on the Performance Prediction

A scaling procedure for modern propeller designs

The Effect of Propeller Scaling Methodology on the Performance Prediction

Contact Info

Product

Resources

About