Disturbance of the cooling-gas distribution in block sized fuel elements due to by-pass flow
Description
The effect of the by-pass flow upon the main flow through the cooling channels of a model of a HTR fuel element is described. The by-pass flow was introduced through a wedge shaped gap located between two succeeding fuel element models. The model scale was 1 : 1. The gap width was varied between 1.85 and 6 mm. A blockage for the entrance area for the by-pass flow was provided such as the entire circumference, one half or one sixth was left open. The Reynolds number with regard to the cooling channel of the fuel element was 1.5 x 104 < Resub(K) < 6.5 x 104. A relationship between the flow resistance of the wedge shaped gap and the Reynolds number is given. Furthermore equations are presented for the effect of varying by-pass flow on the distribution of the main flow through the cooling channels. (orig.)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
An einem HTR-Brennelement-Modell wurde der Einfluss einer Bypass-Stroemung auf die Hauptstroemung durch die Kuehlkanaele der Brennelemente experimentell untersucht. Der Bypassstrom wurde ueber einen Keilspalt an der Trennstelle zwischen den uebereinandergesetzten Brennelementnachbildungen zugefuehrt. Der Modellmassstab betrug 1 : 1. Die Spaltweite wurde zwischen 1,85 und 6 mm variiert. Ferner konnte der Zustroemungsquerschnitt fuer den Bypassstrom durch Begrenzung auf 1/2 und 1/6 des Brennelementumfanges geaendert werden. Die auf den Kuehlkanal des Brennelements bezogene Reynolds-Zahl betrug bei den Untersuchungen 1,5 x 104 < Resub(K) < 6,5 x 104. In der Arbeit werden Gesetzmaessigkeiten fuer den Stroemungswiderstand des Keilspaltes und die Aenderung der Kuehlmittelverteilung im Brennelement unter dem Bypasseinfluss abgeleitet, die die Abhaengigkeit von den oben angegebenen Versuchsparametern wiederspiegeln. (orig.)
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Additional details
Additional titles
- Original title (German)
- Stoerung der Kuehlmittelverteilung in blockfoermigen Brennelementen durch Bypass-Stroemungen
Publishing Information
- Imprint Pagination
- 30 p.
- Report number
- Juel--1185
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 6210472
- Subject category
- S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
- Descriptors DEI
- BYPASSES; COOLANTS; FLUID FLOW; FUEL CHANNELS; HTGR TYPE REACTORS; REYNOLDS NUMBER
- Descriptors DEC
- GAS COOLED REACTORS; GRAPHITE MODERATED REACTORS; REACTOR CHANNELS; REACTOR COMPONENTS; REACTORS
Optional Information
- Notes
- 36 figs.; 4 refs.